The thing that's been keeping one from showing up in our garage is the several hundred dollar air compressor that is also needed. My dad wants one to run some basic air tools off of, but I keep telling him to just do it right the first time and get a bigger unit. Then the problem becomes weight. We want to mount it in the rafters of the garage so we don't use up an precise floor space.
Once again, the Benjamin's just aren't growing fast enough... maybe I should plant another tree in the back yard.
Have you tried other media then the glass beads? I keep hearing great things about soda blasting but I think you need some extra equipment to use it so it doesn't clog the gun.