I use a cobra and a mosquito. What sold me was that Suunto is a more conservative computer. The cobra allows only 33 feet per minute while the Aeris will let you accend at 60 or 66 feet per minute. The Cobra does cut a few minutes off of your NDL, but not enough to bother me or cut dives short - I use up my air before I hit the NDL.
I just read more conservative and safer...not better mind you, just keeps me even more in the safe zone.
The other factor is that as a hoseless computer it sometimes gets the signal inturupted by strobes on a camera, just like all the other hoseless computers that I've seen.
But if you don't do photography, or don't dive with others that do, then it really won't be a concern.
