My wife decided my amp was too loud, even on the 2W setting (Mesa Cali Tweed) so I justified an attenuator to make her happy - solid justification. It works great as one would expect from Dr Z. The amp sounds just as good as un-attenuated, except for the lowest setting where it gets a little thin - noticeable but not completely anemic. Overall very pleased with it. Some very useable tones at a palatable level for home.