APC make Audio type stabilization devices, which include high current capability on certain outlets. They have crossed over from their much bigger IT business (clients like Sun, IBM, Google etc.) where they protect data from power nasties (brown outs, spikes, noise).
They are reasonably priced, are UL listed and their products obviously work for business. What they lack in boutique mystique and hyperbole in their advertising I think they make up for in their good value and solid engineering.
BTW: Since the 90's many power supplies for PC's, shavers, rechargeable batteries, you name it, have gone to cheap and dirty SMPS (switched mode power supply). There is a greater need for power conditioning than in the past (when most electrical devices used the more expensive power supply transformer with it's excellent isolation properties). If you own a PC or modern TV and it is plugged into the same circuit as your stereo then a power conditioner may make an audible difference.