Got it from online store, not worth the trouble to ship it back since this is quite a quick fix.

Never taken apart a PS controller but this is quite easy to take it apart

I only have the gulikit so I can only give you my opinion on that. The controller feel extremely well built, I like it more than the switch pro controller after some mantainance. I used it for the switch and PC with no noticeable lag on Bluetooth, they do have a 2.4ghz dongle. There are problems with my when I got it. The gyroscope and joysticks need to be calibrated and one of the abxy button slightly binds on press. Have to take it apart and lube it.