I've had my X-55 nearly a year now.
The main thumb button, and the up and down on the castle hat don't give as much tactile feedback anymore... there's no snap or bump to them, but after the way I've spammed mission boards with them I can forgive that, and they still function. The X axis on the joystick is a little loose close in to the center... it wiggles a few millimeters, but well within a fairly standard deadzone setting.
After hundreds of hour of use it definitely feels very broken-in, but it still functions 100%. Do I just have a unicorn? If I have this kind of luck, why am I single, and not able to print money in a Vegas casino?