I bought the end-cap switch for my mini-mag and absolutely HATE it! The design allows the switch to be turned on when bumped at the end, even when sitting in my belt-sheath! I've discovered that I have to unscrew the switch in the globe as well as hit the butt-switch to be sure it stays off.
I've got two 3-D cell Mags that have been bulletproof. Canoe trips, kayak trips, hunting, kids, they've survived them all! They do chew up Ni-Cd rechargables, but I've not noticed any "damage" caused by using them. (I'm upgrading to NiMH soon, that should be an interesting experiment...)
I have one Mini-mag that's been through the worst I could dish out and is still going strong, but I've also toasted three other newer mini's in the last few years maybe something's changed in QC or design recently?
Gotta bite the bullet and go for a SureFire soon...
J-