I've had a Weber Mini-mass 50 for the last couple of years that I use for gigs and at home for my 64 Custom Shop Vibroverb. I use it to knock off a few dB's off so I can run the amp a little hotter. For the clubs I play, I can get the unattenuated volume on the amp up to 3, 4 max. This is a little cold sounding to me, so I like to crank to 6 and then attenuate. Anyway, I took a chance on the Rockcrusher. This thing just KILLS the Mass. The mass seems to compress the sound and take away the extreme lows and the extreme highs, leaving a mid-heavy tone. Switching on the treble boost doesn't help, I don't like the frequency that is boosted, too high and ice-picky. Anyway, I have used the Rockcrusher extensively at home at the 12 dB level and I can't hear ANY change in tone from the bypass setting. Almost like getting a new amp. I think the 8dB setting will be just the ticket at gigs. I've played around with the lower settings a little, and the Studio setting. The EQ switches work very well and are centered on good, usable frequencies. It can get down to whisper quiet. Of course it doesn't sound great down that low, but it's usable. All in all I'm happy with the purchase,even though it's 5X the cost of the Mass!