They feel like a name brand
I have purchased several sets of different colors to customize controllers for my friends. My only criticism is that sometimes the parts can be slightly wonky.
For example, on the pink and red sets that I got, the z-buttons were a bit too tall, making it awfully difficult to press the button. Not a big problem though, because I just shaved 1/8 of an inch off and it fit (and worked) perfectly. It also seems common that the shoulder triggers are missing the slots for the metal elbow that is normally inserted on legacy controllers. Also not a problem, because the controller functions just fine without it.
As you can see, any person who's even slightly 'savvy' can work past these minute issues, but because they exist, I'm reluctant to give 5 stars. All things considered, the sets are wildly cheap for how great of a product you get. I highly recommend that you get them, because having a unique controller is DEFINITELY worth $10.
P.S. The least problematic sets I've gotten have been White, and Dark Blue. (solid, not see through)