I run the Aerostich off-road studs in the rear tire (Kenda TrakMaster II) of my TE450. I've used it on road and off for about 6 seasons. I've never lost a stud. They get alot of grip. I'm very careful if I need to ride on dry pavement with them tho'.
Aerostich suggests studding every other knob, thereby taking advantage of the studs on ice, and the rubber on dry or wet roads. Kind of a trade off for the best traction in different conditions. I put one stud in each knob on the rear tire and that was almost 100 studs.
I've always used ice screws in the front tire.
This year, I'm going to stud up both ends of my DRZ using Aerostich's 'every other knob' system.
I think WER sells 'grip studs' too. Same product as far as I can see.