I don't own one because I don't need the shiney brass. I just need it cleaned. And metallurgy 101-any time a harder metal bounces around against a softer one, you will get work hardening. I know case mouth peening is from the cases hitting each other. I've been doing this for over 50 years. However, any case hardening caused by the steel media is a moot point, since the case neck of the cartridge will have failed or case head separation will have begun long before the very minimal case hardening of the body of the case has had an effect. Annealing will help with case neck cracking, but case head separation is something I haven't seen a fix for. If you've got one I'd like to know what it is. I just use a vibratory because I am cheap. I don't want to spend the extra money for the system. I'm cheap, cheap, cheap. Also, if it works, don't fix it. I don't think its a bad system, I just don't want to spend the extra money when I could spend it on a new 35 Whelen custom Remington 700 with an E.R. Shaw 1 in 14 inch twist 26 inch barrel. And its in the works right now, along with the mounting of the P2 Shepherd scope. I have several friends that have the wet system, though. It works pretty good.