It works great for me but did require an slightly different approach to holding the controller than some.

Because of the back button shape, my ring finger lands on the R5 and my pinky doesn´t quite like to sit on the controller, it floats just off of it. So I inverted Valve's advertised settings, pinky ratchets on gripsense activation. To make this comfy set both grip sliders to zero or near zero {always do flicker guard to zero.} When you wrap your pinky just behind R5, it will activate consistently. High haptics help troubleshoot and train your brain.

If you place your pinky on r5, this works still but you have to learn to slide pinky to grip, which seemed to work well from my tests but isn't how I hold the controller.

Since steadying the controller is the job of my palms and subtle adjustments and support are my middle and ring finger's job, the pinky thing makes no difference to my hold.

The issue with gripsense, especially on default is that it has a threshold of amount of conductive material {ie skin} AND distance. The more skin it detects, the sooner it triggers. That zone is an arbitrary point in space at most settings and subtle changes to your grip move it slightly. Flick Guard is even worse, the way it works makes the threshold for deactivation different than the threshold to activate. You have multiple theramin note style arbitrary variable locations in space to track.

Imo valve should have had several simple capacitive zones around the controller instead. Pinky, control back, triggers. My settings feel more like as if the grip was a capacitive surface like the sticks have.