[original, 1-star] i launched up Mario Sunshine and Smash Bros and something with the D-pad and C-stick felt off. it was doing weird things that i couldn't figure out.
then i went into the Switch's settings to test the button presses. that's where i was able to pinpoint the actual problem.
* when i would press Left on the D-pad, it actually came through as X.
* when i pressed Right on the D-pad, it came through as Right Left.
* when i tilted down on the C-stick, it came through as holding the X button.
i submitted for a replacement, so i'll update this review when the new controller comes in.
[update, 4-star] i received my new controller about a week later. and this one doesn't seem to have any issues. i took it straight into the settings to test out every button. and every button was correctly going thru. then took it on a test run in Smash Bros, and also had no problems.
* motion controls work.
my only problem with the controller now... it feels way too light. it feels little heavier than the PowerA wireless GameCube controller (which has to take AA batteries). but the weight of the Pro Controller is a lot more, which is what i'm used to.