I've got one as well, had it for about 12 months. I use it for all my dives and have been using it for some decompression diving. I've had a mixed bag of experiences some probably my fault, some being issues with the design.
I'm generally happy with it, on dives within the NDL it is fabulous.
- when you go into decompression, it no longer shows you your run time on the main screen, it only shows you your "TAT" (total ascent time) or your decompression obligation according to their algorithm. To see your run time (more useful than TAT if you're running to tables or diving with someone on a different computer) you have to press one of the buttons. This is a minor thing, but I think it could be an issue if I'm heavily task loaded or stressed (if anyone knows how to stop this, I'd love to know)
- It had an absolute fit on me on a 35m dive on air and told me I had 599 minutes of decompression owing only 5 minutes into the dive. I had to end the dive as a result, and relied on my knowledge of mental tables.
HOWEVER, giving credit where it is due, the Geo 2.0 continued to give me depth and time during this incident (although see my first point, I had to change to a different screen to get it) so I was able to run tables. My SUUNTO had a similar problem and told me I had a ppO2 of 2.8 or something ridiculous and then didn't bother to give me useful dive data.
- To get the computer to light up so you can read the screen in dark spaces (wrecks, caverns, sinkholes and depths) you again have to press a button. Again, I dislike this from a task loading perspective but it's manageable most of the time.
- The 'watch' band is a real PITA. I'd love to be able to use a bungee mount, or a strap or something rather than having to buckle it every time. Especially around my drysuit, I have to use the 'extender' strap, which basically is just another possible failure point (yes, I have previously dropped my computer over a 100m drop-off - and yes, that was a very expensive accident).
My pet peeve is that the dive logging software doesn't work on my mac.
I'd probably give the computer a 7 to 8 out of 10 for my diving. I'd recommend it without hesitation to a new diver who is looking for a good computer they can grow with, but I don't think it's the be-all to end-all.
