I agree with Pres and Doris, you really shouldn't start students out with a GG simply because they don't learn any other way of trimming. Speaking from experience. My first teacher didn't know how to trim, so she had everyone trim using a GG. When I set up my own studio, I automatically bought one. After that, I learned to trim using a foam pad on a bat, on the wheelhead, using a chuck, etc. I do however still use that device! For tall things, or in the way Marcia described.....it's a pretty handy tool! Yeah, and I use the splash pan too! And a slab roller. Yep.