I've had an x55 since 2015. It's been good except for that little nub stick on the throttle thats supposed to be a mouse/slew. Never worked right.
It isn't analog anyways so i didn't bother trying to fix it. I did have the pot, in the twist part of the stick, go wacky on me around January of this year.
I removed the stick from the base and opened it up and found the pot only needed a good spray of electrical cleaner and put back together.
I put dielectric grease on the mating moving surfaces. It doesn't dry up and is safe on plastic and rubber.
One more thing...when i first got this hotas, i had problems with "ghost buttons". I found out it was because i had the individual usb cables to the stick and throttle crossed and laying on each other.
Once i made sure they were always separated, no more ghost buttons.