Overview:
This is a unicorn of a product that I cannot find a true competitor for. Other products either don't have the same feature set at the same price, or they have the same features but are 5x the price. I haven't experienced any change in picture detail, latency, or processing artifacts. I have an xbox one, nintendo switch, and a mac mini hooked up to this thing and I LOVE the automatic switching on this product. I almost never have all 3 putting out a signal, so the ability to change my TV's input with my universal remote and then just turn on the device I want use effectively added 3 HDMI ports to my TV for under $15 if astounding.

Latency and Image quality:
On my xbox I like to play competitive games like Overwatch and Warzone where added latency would be experience ruining and I cannot feel a difference no mater how hard I try. With latency testing equipment you might be able to see a difference, but after correcting my TV's settings to turn off any image processing or color enhancing there is no perceivable latency. On my Switch I like to play games like Mario Maker 2, Katana Zero, or Octopath Traveler where there are some amazing colors (my TV is not HDR capable so I can't speak to the ability of this product to pass HDR content through) and there is a surprising lack of fringing, bleeding, or shifting of colors. There is also no change in image definition or evidence of compression. All devices are outputting a 1080p signal and to my eyes, that's exactly what's being displayed on my TV. Everything looks exactly the same through the switcher or directly into my TV. Honestly having both of these qualities in a product is something you usually have to pay quite a premium for, and having both at the same time is a miracle.

Input Switching:
Beyond convenient. The automatic switching to the most recently sent signal is perfect. I can be checking in on my home theatre PC and be managing my Plex library, and then grab my xbox controller to turn on my xbox and it will automatically change over to the xbox. To switch back over to my Mac, I would have to use the included remote or go press the button to change inputs, but that isn't a situation I often find myself in. The one time I remember being in a situation like that I seem to remember it switched back after I turned the 2nd device off, but I could be remembering that wrong. And if you have a programmable universal remote, it wouldn't be difficult to manually map the included remote to some spare buttons on your universal remote. I've just been too busy and haven't had that issue enough to do it myself lol. Again, just a magical experience regardless of price point, but especially notable in something this affordable.

Downsides:
Nothing major to report here. Depending on how you handle powering all of your devices it might be inconvenient to find a power source for this device. My TV doesn't have a USB port that supplies enough power, and my xbox/switch don't supply power through the USB device when powered off, and my Mac mini is too far away for the power cord to reach. But because my power strip IS close by and has included USB power ports it isn't a problem at all for me. If you have spare cell phone charging bricks and a close enough AC power port then you're chillin'. Honestly if you are looking for a product like this, then you most likely have a way to power this device in a close enough spot that it shouldn't be an issue. If you need to go do a quick measurement, the included (and extremely uncommon) power cable is around the same length as an included iphone charging cable (~3ft / 1m).

Tl;Dr:
If you're looking for a product to effectively increase the number of HDMI ports on your TV, and you just 'want it to work' boy do I have a product for you. I love this thing, and It's been running without issue for over 2 months now. If you are reading this, buy this thing.

Turned my computer monitor into a perfectly working TV for streaming and gaming without messing with wires all the time

This is the one for Me

After buying several types of adapters this is the one that worked for me
and i did not even have to plug the power in which was surprising to me as others did not work.

This is a Buy
If you have a PS4 You may have to use the power on this box

Working perfectly as expected. Using my monitor with 3 laptops. It automatically switches to the one which is On.

Device works well. There is no difference in picture quality between going through the device or going direct, which is good. I would recommend getting the device if you needed 2 extra HDMI ports. When using the device, my A/V receiver instantly recognized there was something there and sent the signal through to the TV. Before, there was always a lag and I either had to unplug the HDMI and then plug it back in or switch the units on and off. I'm not sure why a remote control was needed, unless someone is using 3 HDMI devices at once and needs to switch them. Generally, when I watch or listen to something, I play it all the way through before going to something else. I guess that if you are one of those TV channel flippers the remote might be useful.
I did have some problems with it:
1). The instructions are short. They don't say anywhere that an external power supply is needed. It does come with a USB cable, which is not listed or shown in the instructions and it does NOT come with the power supply. Also, the specifications of the device are different with what is listed on the Amazon website. Even though I consider myself tech savvy, I needed a bit more than was listed in the instructions.
2). Support for the device was difficult to get. The email address listed for support did NOT work and I had to contact them through Amazon. They did reply quickly, but communication was difficult to understand, like their primary language was not American English, which is what I speak and what the majority of the people in the U.S. speak. They said that they fixed the email support problem but I haven't had to attempt to contact them again, so I don't know for sure.