I have a Suunto Cobra and both versions of the Suunto DM software loaded on my computer. I download all my dives, and it's fun to play around with the graphs and logs. I like diving with the Cobra a lot, and think it's an excellent dive computer.
However, at the end of the day, I think it's worth pointing out that both versions of the Suunto DM software are incredibly feeble, especially considering what the interface costs. They're both filled with bugs and features that don't work properly. Suunto admits to some of these on their own website.
I routinely download freeware programs for other computer applications that are ten times better implemented that Suunto's software. If it was for anything else other than diving, I would have packed the Suunto PC interface/software back up and returned it a long time ago.
My point is, if your LDS hasn't already talked you into buying the interface, think twice. It's a cute toy, but it's limitations and bugs can be frustrating. I'd like to see Suunto get it in gear and develop something that's on a par with most other commercially available software (heck, these guys make Microsoft look good!). It would take very little effort for them to bring the software up to speed, yet they haven't even done that, despite their own awareness of the programs' bugs. Can't they find some 14 year old Finnish computer nerd and have him work on it during one of their six month long nights?
Unfortunately, the only advice I can give anyone who is waiting for these improvements to happen is the same advice given to all scuba divers - "don't hold your breath."