i have the same Weber Mass 100, switchable ohmage and a few tone tweaking bits and pieces. it's the only attenuator i've used, so i can't comment on how it compares to others, but it is definately more affordable than others, is more versatile with it's ohmage switch, and i've been quite happy with the results. of course it doesn't sound quite as good as the amp on it's own, but when you have no option but to reduce your volume levels, it's not a bad compromise.