As a first impression, I have to say that it is quite close to the originals, apart from the fact that it recognized them directly, it also recognizes the colors.
This is important because one of the main problems that imitations may have is in the software and connectivity, but in the short time I had them in my hands, I have to say that I didn't have any of these problems.
The front buttons have a slightly deeper press and are softer, they remind me more of the PlayStation 4 controller.
As for the back buttons/trigger buttons and the analog sticks, they are the same. The plastic material feels worn out, maybe they don't have the same gloss as the originals.
It has an IR sensor, I don't know if it works because I don't have a game that supports it like Ring Fit.
Something else I noticed with these is that they have a better lock. The original joy-cons that came with my Nintendo Switch had one with gaps, causing it to shake a bit when I held it with the console.
The originals started having the first problem with the stick (drift), this happened after 2 and a half years, and a little later one of the back buttons, R1, started to not respond when pressed, but it only works when pressed in a specific way. They had heavy use, I may have played 1000 hours on the Switch.
Update:
The "home button" (the button on the right joy-con with the house symbol)
If the switch is inactive for a few minutes, you need to press it for a long time or double-click it to wake up the switch from sleep mode. However, when the switch is on and you want to go to the game library or minimize the running game, it does it immediately with the first press. I don't have this issue with my old joy-cons, but I don't consider it a problem.
Anyway, after 20 hours of use, everything is fine.
I will increase or decrease the rating depending on how long they last and how soon they develop the known drift problem. For now, everything is good. I would definitely buy them again because they cost half the price of the originals.
It has been a month since I bought them, I use them for about 2 hours daily, and they haven't presented any problems. I give them a 5-star rating because of the price difference compared to the originals, for which you have to pay twice the amount, even though they are far inferior to the competition and known to have issues.