I use tube amplification so having a power conditioner that (a) cuts the mains power completely and (b) offers sequenced on/off cycles is a must. I've had a simple, cheap Rotel RLC-900 (about $200) for years and though I'm sure there's better out there, I've never had a reason to upgrade. It does its job competently, reliably and without fuss. I've also never been able to hear any sonic downside to using it having compared the sound of various components when plugged into the Rotel and then directly into the AC socket.