It looks like a good mouse for the middle hand.

Cant say I've ever had trouble clicking...

Sounds like a nice mouse, and I like Logitech quite a bit, but this is a LOT of marketing. High speed clicking & Delta Zero sensor technology - it's a mouse, not military equipment. I'm holding out for a mouse with Light speed clicking & a Flux Capacitor sensor that allows me to go back and correct miss-clicks. High speed & Delta Zero just isn't going to cut it.