electronics + water = problems
My first D3 gave out on me, but the company gave me a brand new one to replace it. Ironically, my Stinger gave out on the exact same day! I sent it in for a battery replacement and now it works fine.
In the past, I have had problems with other Sunnto computers. I had one, I think that it was called the Solution, that gave out on me over 2 dozen times!!!:head I sent it back to the factory four times, if I remember correctly, and the totally replaced it twice! Having a computer quit on you when you 45 minutes into deco is not fun, and probably one of the main reasons that I switched to a DIR dive system using only bottom timers.
When Sunnto came out with their first diving watch, the Spyder, I bought one and could only get 44 dives out of it before I had to send it back in for battery replacements. I upgraded to the Stinger under one of their trade-in programs a couple of years ago, but the trade-in cost me more than my D3!
I still prefer my D3 to my Stinger, for both free diving and scuba diving, because of it's timing features. For Free diving it has a nice surface interval timer that counts in seconds, not minutes. For tank diving, I really like the bottom timing feature that also goes in seconds, not minutes. This comes in very handy when doing deep stops. Being able to count your deep stops from the second you get on level, as opposed to waiting for another full minute to start them, can save you a LOT of time when coming up from a deep dive in cold water.
Just because I have had troubles with the D3 in the past in no way would make me want to get rid of it- it's too nice of an instrument. Just remember that anytime you put electronics in water your going to have a problem eventually- don't even get me started on flooding strobes and cameras.:vangry
Sunnto also isn't the only one who has had problems. One guy I used to teach with had his Monitor 2 (dive computer) reading 311' while he was still in the pool! If you check into any of the stories on this site you'll find out that Uwatec has had more than A little trouble with their stuff recently. It's all part of the experience.
Just my $0.02
Jon