The controller works but the one I have, the four button sensors were terrible. I have to press HARD for them to log in and that only makes it worse. I already have to buy another one, but this time I'm buying directly from Nintendo.
Pros
Built for the Switch -- The left joycon controller was built for the Switch. It has the same button layout as the official controller and can be a good alternative to the OEM Switch joystick (L).