Still have my TrackIR5 from back then. Dusted it off so I could play me some Elite Dangerous. Still works as well as the day I first set it up.

I had a TrackClip Pro too, but that didn't fair as well. My headphones tend to end up on the floor when I'm not wearing them and the TrackClip Pro just couldn't handle that kind of treatment. Still have the free hat clip though, and that thing is damn near indestructible!
Good design... seems it's built to last.