I got mine yesterday...I'll tell ya what John, I went last weekend and tried a Dr. Z Airbrake, a THD Hot Plate and a "The Ultimate Attenuator" then lastnight and today tried my Weber Mass (I went with the 50 watt Mini version...same attenuator you got but w/o the toine stack for DI use) and I have to say they are all killer units for what they do. I like them all but the fact that the weber works on any impedence and that fact that it was a goo bit less than the Dr. Z ($300) and the Ultimate (over $500) I like the Weber just fine. Great for trimming down the db's but (like you and Lew already said) NOT to make any amp over 10 or so watts a practice amp and also remember...an Attenuator is NOT a master volume...