I had an issue with the Vyper's depth sensor.
I used it for 35 dives in the Galapagos, left it alone for 2 years (after having cleaned it properly, and it was inside a cupboard, shaded and with dry air). Then turned it on a few months later, and boom - I apparently was diving at 12.4 meters. Nothing I could do - it wouldn't budge out of dive mode, not even after a real dive. Stayed like this for a week or so, until I finally had time to go to the Israeli representative of Suunto, Dugit (דוגית,
http://www.dugit.co.il).
I read on-line that depth sensor issues are common with Suuntu Vyper's, and that Suuntu had increased the warranty period from 2 years to 5 years for such depth sensor issues. But - this was in the US of A, and I'm located in Israel.
The people in Dugit were helpful and very nice, but they explained to me that usually Suuntu offer a major discount or a trade-in for a different model in such cases, as they think the 5 years thing indeed doesn't apply in Israel. But - they'll check what they can do, after talking to Suuntu.
That same day they called me and told me that I can come and get a new one Vyper instead. So, that was good.
However, I was blown away by the fact that a 2.5 years old, barely used dive computer can become faulty out of the blue, after not having touched water for more than 2 years.