I'll give one vote for the Vyper:
Try this thread -- it includes some good discussion on the Suunto Vyper and Cobra as well as links to other recent Vyper discussions on scubadiving.com:
http://www.scubadiving.com/talk/read.php?f=1&i=340377&t=340377
I wrote a brief Vyper review on this thread as follows:
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First of all, for anyone looking for technical data on Suunto computers, you can download the manuals at sea-quest.com. Here is the link:
http://www.sea-quest.com
There is also a nice feature on this site that allows you to run a demo right on the screen of your PC -- look about halfway down this page for the "Download a demo" link:
http://www.sea-quest.com/pages/dcomp/dc_vyper.html
I own a Vyper, although I only have about 10 dives on it. I wear it via a wrist mount. Here is my brief assessment:
THINGS I LIKE:
- Large, easy to read display -- main screen features current depth, max depth, elapsed dive time, temp and consumed bottom time (as % of remainaing NDL). Also has a graphic/bar chart display for % of NDL time "used" and ascent rate
- Automatically turns on when you enter the water
- User-changeable batteries
- Low battery warning signal
- Back-lighting feature on display -- can be set to 5 or 30 second duration
- Conservative -- Suunto computers are consistently rated as one of the more conservative (regarding NDLs and ascent rates) dive computers -- I LIKE THIS (some folks find it bothersome). Ascent rate monitor wants you to adhere to a 30 feet or less per minute asent rate or it will start to "get mad" at you. Again -- conservatism like this is GOOD IMHO. More aggressive divers trying to squeeze every last minute of NDL out of their dives may find in too restrictive.
- User defineable conservatism ("standard" setting is conservative vs. most other computers, but you can make it even more so if desired)
- Imperial or metric
- PC downloadable
- Dive log feature that lets you review past dives without having to screw around with a PC download -- gives you max depth, avg. depth, time, temp at max depth, surface interval on multiple dives as well as the ability to run a "speeded-up" look at how your depth profile was curing the entire dive
- Built in safety stop feature
- Flashing warning light if you ascend too fast
- Air, Nitrox or Gauge modes
THINGS I DON'T LIKE
- Menus for choosing settings are sometimes slightly confusing, but this is not an issue when you are diving, and if you have the manual or the "cheat sheet" with you, it's no problem.
- Plastic face guard sometimes makes reading it at night difficult if you shine a light directly at it....this is not a big deal, just takes a little getting used to (and may not be unique to Suunto). It's just a matter of having the computer on the outside fringe of the flashlight's beam when you look at it.
All in all, I give it a thumbs up -- definitely worth a look.
Hope this is helpful.