Ditto for me!!!... it would really suck to lose your machine through the ice, but your machine and your life!!!?
I know most of y'all need another winter suit like you need another hole in the head, but if you're looking for another suit you should really check these out... they're remarkable!
http://idigear.com/video.php
They're about 1/8 the weight of a regular floation suit and 1/8 the thickness... but have enough floatation material to float 3 adults!
Obviously I don't snowmobile or ice fish, but I do fish over frigid water... and I bought one just for that purpose!