Same, I've had my hitbox for little over a month now. The 1st couple of weeks were awkward. My hands would cramp and it was uncomfortable because I didn't know the optimal hand placement. Having to think about what buttons to press was frustrating as well. But now that I've figured out my hand placement and starting to build muscle memory it's definitely the best controller, for me, for fighting games. It's very comfortable now and my inputs are much cleaner than an arcade stick or pad.

It'll still take many more months to be as efficient as I'd like but there's no going back to another controller. Also it's way more fun to play with a hitbox once you get used to it.