I just bought a Suunto Cobra. I think it's very interesting-and fun. However, with the money I paid(430 big ones at DiveInn.com) I could have gotten some stuff that would have been a better investment i.e. drysuit, airline tickets to Cozumel. I was greatly disappointed to read in the Cobra manual where it said to use a backup to monitor your pressure and depth-I mean I just laid down almost $500.00 and now you tell me to buy an analog $100.00 gauge!?? I have been told that the Cobra is quite reliable and that many divers do recreational diving without the backup and never have a problem. However, I plan on diving in ice(a no-no according to the instruction manaual) and in general I don't like relying on something so complicated. So why did I buy one of these computers???-FUN-it's fun to monitor your breathing with the air integration, and it looks cool, and you can monitor your N2 on multiple dives. But from a practicality stand point it just doesn't make sense.
I think it's different if you get a VERY advanced nitrox and 100% O2 monitoring computer-then it's an investment in deep technical diving-in addition you'll need a backup computer(the ugly backup rears its head again) and a bottom timer. In this case it's your life - not just for fun that you're monitoring your dive profile. This is a very spendy scenario-just ask any technical diver.