I've had an ITB-100HD for over 4 years now I believe. Bought it via a random and risky email transaction and it came from Korea.
It hadn't missed a beat for 3 of those years, but I have started having problems with it. However, I think i've pinned it down to swapping to Sandisk Ultra cards - it seems to kill them.
Going to try Sandisk Extreme I think, or Transcend.
I thought the camera was broken, so looked for a replacement. To be honest, I can't find anything much better for less than £150. It's annoying!
I also have a lot of respect for the camera, since it was solely responsible for putting them blame firmly with the lying weasel lorry driver in this video, save me the excess and made my insurance company threaten him with court despite having no other witnesses