I don’t think the TrackIR camera ever breaks. Until a year or so ago, A few people were still playing with TIR 3! Unfortunately, it’s a different story with the Track Clip Pros… wasn’t there a place where you can order a pre-built DelanClip?
Still have my TIR 3 Pro, which will be 10 years old by now, I’m sure.
EDIT: 12 years in fact! Ordered it 4th Feb 2005!