Carthaigh -
My Vyper Air is sitting at my home in the states waiting to be picked up in a few days. (I'm overseas right now). I've been using the Vyper2 which is pretty much the exact same interface minus the nice Air Transmitter function and an improved compass. Overall it's an EXCELLENT computer. Easy to use. Large Display. Big buttons. Conservative algorithm (which will keep you alive). Since I've yet to use my new Air with the wireless transmitter, I can't comment on that yet, however, according to others I've spoken to, it's quite reliable.
That being said, you mentioned you want to eliminate hoses. With a sport like diving which is all about safety and fun, it is always a good idea to have a back-up "just in case" something goes wrong. If you get rid of your SPG and rely totally on your computer - if your transmitter fails, get's flooded, or worse yet, your entire computer goes kaput, at best, you gotta cancel your dive unless you have a backup. At worst - well, you know what could happen. I will carry a full backup (SPG, depth gauge, and compass) with me. Can't put a price on peace of mind. To each their own.
P.S. Leisure Pro just raised the price of the Vyper Air to $785 USD. It used to be under $715. I don't know why....
** UPDATE: As of July 5, 2009, LP has raised the price yet again to $799 USD for the Vyper Air...must be summer time pricing! **
Enjoy!