Arc-Zone tungsten grinders?

[Greenbuggy]

Anybody buy or have experience with any of the arc-zone tungsten sharpeners?

I just bought the "sharpie standard" figured I'd give it a try. I seem to have a problem with people using the "TUNGSTEN ONLY" labelled grinding wheels and using them to grind whatever the hell they feel like grinding that ISN'T tungsten and contaminates my work and generally causes me headaches.

Also I'm trying to get more into doing aluminum work as I have a couple buddies that want me to weld bungs into intercooler piping and what not, and I hear that aluminum is even more susceptible to tungsten spitting and contamination than the steel and stainless work I've been doing lately