This thing works perfectly! It can get my 15-watt tube head down to below speaking volume, and the knob is really smooth--no jumping from zero to one-hundred with a teeny turn. Additionally it is super cheap, and way better constructed than attenuators twice this one's price, like the Bugera Powersoak. This is a fantastic deal.
This is a fantastic amp attenuator available from Carl's Custom Guitars' channel on Reverb.com (https://reverb.com/shop/carls-custom-guitars). It's a bargain around $40 and soaks up to 60 Watts. Pair it with a 50's Bassman, Deluxe Reverb, Super-Sonic, or any of the Blues/Hot Rod amps to get that cranked and creamy tone at a bedroom-friendly volume.