I can't speak for any other model but the Stealth HD. But I bought the Stealth shortly after it's release so I guess that was about 3 years ago.
It's held up great in the wet, dust, heat, cold.. the only issue I've had is with the remote. I replaced the battery so the next step will be to replace the remote but it's only $20. The remote has been intermittent at times which has sucked because I thought I was snapping photos while going down the road only to find out I wasn't.