I have had many issues with the buttons (mostly, perhaps even only the d-pad) "hanging" on presses. Either I press the button only ever so slightly and it acts like I'm holding it in still (for up to a second or two even), or it just doesn't register my presses at all, leaving me sitting there not moving and totally vulnerable. Suffice it to say that this put a big damper on my using the controllers I bought for shmup high score contests.
I'm hoping that they'll work better with my AVS when it arrives.
Yeah, that's basically the issue I was having. RetroRGB's problem with it went away after he reassembled the controller in the NES controller shell, so I do think it's a matter of too much pressure on the D-Pad. I'd recommend using a game with an onscreen menu (allowing for navigating to selections for up, down, left, right) to calibrate it by loosening the screws on the left-hand side a tiny bit and testing the D-Pad until it becomes more responsive. It doesn't take much, and the case doesn't feel loose at all. It has to be a hardware issue, so I don't think you'll have any different an experience on the AVS. If you try it, let me know how it goes!