I have the Aeris Atmos 2 and love it. I dive wet and for half of the season find thick cold water gloves on my hands. The aeris has big easy to use buttons that I can use even with the thick gloves. Like Larry said, it also has big display numbers that are easy to read too.
I don't know how any of the other computers work so I cannot make any comparison, just tell you of my expierence. I frequently dive air and only occasionally use Nitrox. The Aeris is easy to put into nitrox mode and plan my dive. On a repetative dive in nitrox mode, if I don't enter the new mix, it will automatically revert to a 50% mix. I havent forgotten to set the mix yet!
The Aeris for as liberal as it is, does not ever hesitate to let me know that it thinks I am acending too fast. Sometimes, in the middle of a dive, I will need to swim over an obsticle, a deep inhale and a stout fin kick, and BEEP!, the aeris tells me to slow down. Don't get me wrong, as a fairly new diver, (just over a year), I think this is great. As I gain expierence and perfect my ability, I have found it happens less and less. I don't think it has happened in a few months.
Lastly, the computer interface leaves a little to be desired but I think it is about the same as a lot of other computers. It is very easy to set up and use, downloading is a breeze. The actual interface software leaves a little to be desired but more features mean more complicated and sometimes, at least for me, simpler is better.
In all, if I had it to do over again, I would still buy the Aeris Atmos 2
Good luck
Ken