I'm using a Genesis Wisdom. I don't think that an AI computer offers substantially more risk than an SPG if you are using proper procedures in the first place.
If an air integrated computer quits on you, you should still have a very good idea how much air you have left assuming you checked your psi frequently and have a general awareness of your air consumption. In this repsect it's no worse than an SPG failure, and you just abort the dive. The downside of an AI computer failure is that you also lose your computer and deco information. But again with proper contingency planning and a watch, you should not be totally in the dark regarding deco status either.
Personally I use a pair of steel tanks and a set of travel bands on most dives with separate regs. The left tank has the Wisdom on it and the right carries a standard SPG. I do a lot of solo diving as well as deep diving and want the redundancy. (And after years of diving with an aluminim 30 cu ft pony, I figured out the weight penalty with another steel tank was minimal when you consider the lead you can remove from the weightbelt due to the negative bouyancy of the other steel tank - the system weights maybe 10 extra pounds) This system is also very flexible and can accomodate dives within the NDL's or for planned decompression dives with or without a different deco mix all on the same basic configuration where the extra bits and pieces like lights, a reel and a lift bag are always in the same places.
In this situation with proper air management, the impact of the loss of the AI computer is pretty minimal as you have a reserve cylinder complete with SPG to abort the dive in a fairly normal fashion with no stress about whether you have enough air.
The Wisdom also has a great simulator mode that in about 5 minutes will let you plan a worst case scenario for an initial or repetetive dive and record the depths, times, and required deco stops. This information gets magic markered onto a piece of duct tape stuck on the top side of my fin. If worst comes to worse, the deco information is quite literally at my feet.
An air integrated computer is like any other piece of scuba equipment - you just need to consider when or how it could fail and then train and plan accordingly.
And I agree completely with the need to shut off any audible alarms. Every diver in the immediate vicinity will hear them and down where it;s deep and dark, it can cause a little extra task loading and confusion that nobody needs. Fortunately the Wisdom allows you to disable any and all alarm features.
