Funnily enough, there are divers who think that the AI feature is not useless. It is expensive though.
If you are buying these computers for the wireless feature, DON'T think that you can do away with a HP hose and SPG - the SPG is still there as your backup in case the wireless does crap out on you. I have a Vytec, and while I've never had problems on a dive with it, I have had trouble with the transmitter once on the surface, and had to fall back to using the SPG for that dive - the problem was user error on my part and not being familiar with the new computer. People that poo-poo wireless without trying it probably don't realise the convenience of having your tank pressure on your wrist along with your depth and dive time - it's just a *really* "nice-to-have" feature - not important, but it sure makes diving more enjoyable.
Eventually the battery in the transmitter will die as well, and while this should be caught through maintenance, it would suck to have a dive ruined because of a flat battery and no way to track your tank contents. So keep the SPG.
Being able to track your SAC on a dive-to-dive basis is fantastic - instead of calculating your consumption manually from dive to dive, you can download your profile (highly recommended anyway), enter your tank details, and see your SAC - it's very handy for future dive planning - and it's quite informative seeing consistent changes in consumption when encountering conditions like current, cold, depth, etc. For example, my SAC increases on deep dives, even though it should stay the same - so I can use that for planning. Using a wetsuit instead of a drysuit in the same conditions - my SAC is higher. Warm water - my consumption drops by a third. All handy to know, and the majority of people never work out their SAC anyway - it's a uselful figure to know.
Nice to have AI? Yes. Need it? No. Would I get it again? Definitely.
