Yes black beauty is a blasting media but I am using a fine 20/40 mix, not the finest but next to it and it is not hurting the metal at all.
And I just added some Maas to some corn cob media and it took it fine, I have a razor in there now and it seems to be working.

This is as expensive as RAD or HAD or SAD, maybe should be know as VCAB or BTAD?

Anyway I've managed to accumulate three of then this week and the one from Midway was by far the best value. However it is the noisiest also but nothing that putting in the garage won't cure which is where it is anyway. So I wouldn't worry too much about noise you guys who are trying to decide if you want to try this. Plus the shipment from Midway arrived in 2 days and that was UPS ground. Of course I only live a few hundred miles from them but still great service.

Ted