I find these about as stiff as regular nylon 1mm picks and grippy enough for sweaty gigs. The Gator grips are pretty cool too.
Anyway, a student of mine would regularly bring along his latest pick experiments which seemed to be mainly super chunky beasts of plastic - 2mm type things, but on occasion there would be something a little more svelte!
Memorable ones include the Pickboy carbon fibre and .....the Dunlop Jazz III.