I've had problems (or at least annoyances) with APC. Can't really remember what they were but couple years ago I bought a Belkin 650W 1000 VA and used it on a dual core PC. Never had a problem. Recently I bought a MacPro with four hard drives and hooked it up to two 24" LCD monitors. In the last month we've had bunch of storm and lost power at least twice. Also had plenty of sags and brief outages. The Belkin has been flawless in keeping the machine running during the brief outages and shutting down when the power was all the way out.