I bought the Furman PM-Pro Series II Power Conditioner for the rack slot of my SWR Super Redhead amplifier, and it's an awesome product! After an initial disappointment of finding out that I needed a separate Furman ADP-1520 Adapter in order to make it compatible with normal electrical outlets, I'm glad that I purchased this unit. Not only does it protect my amp from electrical damage without sacrificing itself, it also cleans up the electricity so that I don't run into annoying hums and ground loops. That means better sound for my gear! Additionally, the PM-Pro II has useful readouts of voltage and electrical current usage, and a cover over its switch prevents accidental shut-off while in use. A BNC lamp can also be attached in back for illumination, if desired. If I had to make the purchase over again, I would actually choose the Furman PF-Pro R instead, since it works better with amps. However, I'm glad that I purchased the PM-Pro II, and highly recommend it!