I bought 3 of these and have used them for a few quickie location portrait jobs. They work well indoors. THE INFRARED TRIGGER DOES NOT WORK WELL OUTSIDE!! Forget the IR and go with Pocket Wizards.

Firing these units with a pop-up camera flash worked very well indoors with my Nikon D-610. I was able to get the units to fire consistently with my pop-up on 1/16th power. That's a good thing if no one else is firing a flash. For weddings, you must use a Pocket Wizard or other radio trigger.

These are totally manual, so expect a learning curve if you didn't serve time in the old school of 'dumb' speedlights. As for me, I like the manual speedlights because they are cheap and they always put out the brightness you set them on. TTL units can be easily fooled.

Battery life is low, because these units may not have a recycle circuit. I didn't get any more flashes on various powers than I did on full power. So every flash, no matter the setting, uses a full power load. Excess is dumped. Too bad. Batteries get hot and fail quickly. Not great for the wedding and event shooters. But for 40 or 50 flashes on a quartet of AA batteries, you get big output.

Summary: Good value

This is my 3rd Yongnuo 560III so pretty much I live by Yongnuo now. Great affordable brand! You can check my work with it through Khang Huynh Photo on Facebook.

I have used a few Canon flashes from the 540ez to the 430ex and these are wonderful! No color issues that I can see. I used these quite a bit in the last few days and I can't stop myself. I am a semi professional photographer and I am impressed! I love these, with a controller it's a great bargain for the price. They are so cheap they are practically disposable. I don't have to cry if one breaks, I don't have to worry if I lose one. Peace of mind because of the great price. Finally a good reliable flash that doesn't cost a fortune!!!!.......Canon, sorry, I will never spend on your flashes ever again! You lose. That 430ex was $299, biggest waste of money ever! That has to be one of the worst purchases I ever made....

As far as TTL, ETTL, those features are nice but they are not reliable nor are they worth the added expense in my opinion. Manual control of the flash is always better than letting the camera make your choices for you....

Update, I have six of these, it's been several months now and no issues. I am very happy I decided to buy these.

I'm a hobbyist with a Sony A6000, Panasonic GX1 and an RX100 (original model, no hotshoe). I bought this flash because it's much cheaper than the native auto flashes and gives the same or more light based on the published specs. Granted it's not automatic but that's a very small hurdle to overcome, especially if you're making use of an ILC. Since the multi-purpose hot shoe on the A6000 doesn't always work with standard hot shoe devices, I'm using the pop-up flash to trigger the Yongnuo and it works perfectly! Taking portraits indoors, I can stay low with the ISO and get well lit sharp pictures. It's powerful enough to bounce off the ceiling, so I can achieve little or no shadows. With the GX1, I can attach the Yongnuo to the hot shoe directly and it recognizes it perfectly fine. Just for kicks, I tried triggering the Yongnuo using the RX100 pop-up flash and that worked just as well.
To get around the hot shoe problem, I purchased a couple of adapters to try and mount the flash on the camera. I ended up with two adapters, the Sony ADP-MAA and Pixel TF-325. I was then able to mount the Yongnuo on the adapters and the camera was able to trigger the flash directly. Only problem is it's quite top heavy though relatively sturdy. However, it does come with a stand and so you can place it on any flat surface or that stand can be mounted on a tripod if required.
With 4 AA batteries I was able to get around 100 or so exposures at 1/8 power. Next purchase will be a battery pack and a wireless trigger to take things to the next level!

Update:
After a little research, it turns out that the Sony hot shoe has a thin layer of black paint on it that causes some devices, like this flash, to not be able to ground itself. Taking a nail file (sand paper would work too), I scraped off some of the paint on the undersurface of the left and right edges of the sony hot shoe being careful not to scrape anything else. And that worked perfectly. So now I can mount this flash directly on the a6000 and it triggers every time.
For even more flexibility, I've added the YN560-TX to the mix. I now have the flash mounted off camera, but I can control all of its settings from the remote controller and of course trigger it.

UPDATE: dropping to two stars. due to wireless function loss.

January 26 2014,
the flash still works. but it no longer allows me to switch to wireless mode. When I press the button the flash locks up. I have to open the batter cover to turn the flash off.. the flash itself still works on the camera. Yes its a $71 flash so I shouldnt be surprised that it has had problems within the year of owning it. I should be surprised that it still works at all.
Its still a well made flash.. it still works, but it doesnt work for everything anymore.. so I am now left in the position where I need to decide if I buy another one or spend the money on a Sony flash..

--------original review ------------

Alright, first of all, I had no good expectations for this thing. I thought it was going to be cheap thin plastic, I thought it was going to have a screen like those old pocket lcd video games they used to sell when I was a kid.. Maybe the fact I was dreading getting this to see what I just wasted my money on helped make me as happy as I was when I opened this thing.. It's awesome.. Its HUGE, much larger than I expected, good solid thick plastic and its put together very very well. the manual leaves you wondering how to use the thing, so that could use some improvement, but if you search Yongnuo 560 III on youtube you will get some video's that show how to use the buttons.

I bought this for a Sony A58 and it works just fine on there.. The A58 has the new Sony "multi interface shoe" I was hoping the A58's wireless flash setting would fire this thing, and it does, but the timing seems to be off, the photo doesn't show any flash in it. If I use regular on camera flash settings I can trigger the flash properly. So of course I have ordered the 603's to help trigger this thing remotely, not that I will do that much.. The 603s do not work with the sony without a mod. open up the unit and solder a 120K ohm or 130K ohm resistor between the VIN (+ terminal) and the J6 terminal (yellow wire). It works, at first you might think that it doesn't, if the screen on your flash has this -- instead of a flash powrer, just hit the buttons to cycle through the powers and then your flash will work great.
Search YouTube for the mod, it will walk you through it.

The thing isnt ttl, so when you get it you will be learning how to use a flash,, Like a moron I started at 100iso in my dark living room with full power and quickly learned I had to move to 800 and bring the flash power down.. And I started playing around with the black foamy thing Neil Van Niekerk has done some videos and written articles about. Do a search on it for your self, amazon removed my links for his page. not affiliated with the guy at all. it helped me a lot to learn about using flash.

I was slow to order this thing thinking it wouldnt work with my Sony, and that is not the case.. If you have the old minolta hot shoe you will need a converter http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=sony%20minolta%20hot%20shoe