I've been away from the stained glass craft for almost twenty years and I've decided to start up again. I've got a small Glastar grinder that I remember it would get bogged down quite easily when grinding an edge. I'm thinking it needs replacement since I can no longer remove the wheel from the shaft. Now I see a couple grinders made by Gryphon, one, (the Twister) has a base that can be twisted to work at an angle and a jet of water is fed directly onto the wheel. The other, (Studio) has a 1/5HP motor which is significantly more powerful than the competition and it uses a gravity type cooling system. Both of these grinders seem to have some good features. However, I'm reading a lot of negative feedback about the Gryphon grinders. Does anyone have any experience with these models that could collaborate these negative reports? A local retailer also mentioned the Gryphon units had problems and he was trying to push the Glastar AllStar at $235. Any comments would be appreciated.