Double o-ring may be fine...never owned one. But cheapy UKs and P Tecs with screw down head for a switch eat butt. My Tec 40 has flooded about 10 times. Just went in for ANOTHER warranty repair and then it's going on eBay. I can tell you for DAMN certain that the Surge doesn't leak nearly as much as my Tec 40 has...hers only leaked once when new, and after the recalled switch was replaced, it hasn't leaked again in the last 2 years...even with a dive to 152'. I still think it's a little cheap due to my bad luck with P Tec stuff, and that's why I'm asking around. Looking at the Aqua Star, it appears to be a magnetic switch...which to me would seem to be the best kind of idea to remedy leakage. It's rated good to 100M. Anyone ever had any experience with it?