I've had the mega float on my 07 apex gt since the shock came out,
I've never bad a problem yet with it but my riding buddies have in extreme cold,
Also the difference in air temp from day to day will change the air pressure in the shock, I'm 180 lbs and found around 140 psi to be a good setting, but it only takes a few psi either way to make for a great ride or a horrible ride,
If I were you I would get a standard apex with the tunnel shock adjustment, much better ride quality than the se in my opinion and your mind is at piece knowing that your shock won't loose air and it will be a long long ride back,
I've demo a standard apex and liked the ride quality of the rear shock over my mega float, My next sled will be a standard apex...