The reason I bought this converter/adapter was to act as a high-amp plug adapter for my hair dryer on a trip to the UK. My hair dryer is dual-voltage, so I didn't need a converter per se. Simple plug adapters are only rated for 3 amps, however, not enough for the dryer. The DoAce is rated for 10 amps, which was more than enough. I almost passed it up, thinking I could borrow hair dryers, but I'm very glad I bought it and took it along.

Once I got to the UK, I discovered that most of the places I stayed, even hotels, did not have USB charging ports for my phone and e-reader. I used it as a charger almost every night. And yes, the hair dryer on its 250V setting worked well in the 220-240V outlets.

The DoAce is quiet, doesn't become hot with use, and comes with a convenient carrying bag that keeps unit, cord, and plug organized in your suitcase.

I recently went to Australia and finally had a chance to use the converter. The first time we plugged it into a 240vac receptacle, my wife plugged the curling iron into the converter socket. (Flag Socket) We flipped the switch on the wall and immediately had an arc from the converter. Shut down everything and examined. Externally, could not see any issues. Made a second attempt and everything seemed to work ok. It was used for the next few days without incident. I still believe the unit should be examined by the manufacurer for safety reasons. My wife's curling iron draws only 1.5amps. Because of the 10amp max rating, I personally would not try to use my wife's hair dryer because it draws 12.9 amps on the high setting and that would exceed the max current rating.
The usb ports worked OK charging our iPhones and iPads. I'll be using it totally on 110vac now that I'm back in the USA.

I like to travel a lot, so I bought this to give me an outlet wherever I may go. It's been indispensable, and I'm so glad I bought it. It comes with adapters that allow it to plug in in many different countries, which is fantastic. It also has a built in overload control, so if it overheats, it will automatically switch off. I highly recommend getting this, especially for such a great price.

Follow directions for both the unit and all appliances to be used with it! I called for all products before I left to confirm usage and had no problems.

Update 10/10/2020
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Do NOT count on their warranty, it is USELESS. They do NOT stand by it, not only that, but they are terrible at communication. it's great when it works, but if it falls, No warranty !!!

Pros:-

1- Looks and feel that it was very well built, and of good quality material, not cheaply made
2- It stays relatively cool (unlike other adaptors), even when left plugged for extended period of times , and uses no fans, so no noise

3- The American flag is printed on the converter side, so it act as a constant reminder as to what is converter and what it not and just act as a plug adaptor (doesn't convert current)

4- I like the USB for faster charge of your small electronics at the same time, rather than using a separate charger, so when on the go, this can replace multiple charger, different ones for iPhone, iPad, android phones etc, which is a big plus

5- comes complete with 3 plug adaptor, which makes it really versatile and universal for using almost anywhere where you need to convert the 220-240 to 110 current or even use the adaptor side with universal voltage electronics

6- Nice Hard protective travel case - although this doesn't come from all sellers, as my first one came only with a less protective travel mesh in a small nice cartoon box, but without the hard case. The confusing thing, that both sellers have the unit for exactly the same price, just slightly different photos, which was very hard to pick up on, till I came to order me second one, and this when I realized that I amassing the hard case. I contacted both sellers. Do Tech confirmed that theirs comes with the advertised hard case, and Gugule, confirmed that theirs sells only with the travel pouch, but when I asked Gugule customer service, if they can help by sending me a free case for my first order, rather than returning it and re-ordering it from the other seller. Abby from customer service, went out of her way, and contacted the other seller, which turned out to be another subsidiary from the same company, and they promised to send me another hard case for free, which they did, and that made me very happy and the nice gesture from both sellers were much appreciated

Cons - or rather wishes for future improvement

1- it would be nice to have it as universal step UP/ step DOWN converter than one can take anywhere in teh world, in the same small size factor/ beautiful design

2- Although the converter side of the unit comes clearly marked with the American flag, I still can see myself plugging a 110 electronic in the wrong, plug adaptor, non converter side, ruining whatever I am trying to plug, as it can easily be done, specially when the plug adaptor is already built in, so it won't make you stop for second to rethink what you are doing, if that adaptor wasn't built in, so I would suggest adding clear wording or a stop sign in red on that sign indicating that, that side of teh unit is NOT a converter and it is to be used only by either for 110 volts machines on the same voltage, 220 Volts on the same voltage, or by a universal voltage electronics - as for me, for the time being and for my purposes, and since all I need is the step down function, I ended up putting a red post it note and taped it over, to cover the 2 plug adaptor sides, sa to act as constant reminder and hopefully help me remember not to burn another trimmer adaptor, as I already did that twice before ( NOT with the adaptor)

I hope this review will be found helpful for everyone.

Thanks Abby from Gugule and Thanks Do Tech customer service for your courtesy and professionalism, but I wish you standardize the unit with the hard case for everyone, which make sense, to protect the unit, which is meant be useful during travels