Hi Mark,
It may be a problem with the sensitivity on the Smart model - my regular buddies use older aladins / aladin pro's without any difficulties.
So far it's only managed to change the gas mix that one time, but it often switches around between battery check / log / planning if I'm waiting on the surface for any length of time.
Not a massive problem, just something I'll be watching for in the future!
Re. the batteries in UWATECs, mine has about 100 dives over the course of a year and is still showing 95% - unless you are doing an incredible amount of dives per year I can't see that user-replacable batteries will be much of a saving... Of course if you are doing enough dives to warrant it, then you'll probably be wanting to gas switch on a Vytec anyway
