I got myself a Kleen Reem which is the same as the Senior pipe reamers. I tried it out - but I think I may have taken off too much cake, lol. I also tried it out on my $5 oak pipe just to see what would happen, it took out some wood and smoothed out the bowl, lmfao - no biggie though. It's fun to experiment since I wanted to see what it would do before testing it out on my expensive pipes.