I bought the $35 eBay special and use walnut shells. Can't fit big stuff in it, only 1.85 qt., but I can fit 2 entire flipper assemblies with mounting plates. I had it running for 3 weeks straight swapping out and it didn't crap out. Gonna start doing another run for Centaur II soon. Yeah, it isn't as nice as being able to throw everything in there at once, but since I separate bags by part/section anyway, it helps keep things organized for those that haven't done dozens of restore jobs and you don't have to use as much medium.