I just purchased an APC J15 for use with my system. Indeed, the UPS guy should deliver it today. I chose the APC for its battery backup feature. In the lightning capital of the world (Florida), good surge protection and battery backup are paramount.
This box does have noise filtering, which I ordinarily wouldn't consider critical, but it is a feature I expect on this class of device (>$100). I'm not sure that AC noise filters really impact the quality of my A/V, but when you're protecting $15K worth of gear, you might as well protect it from little bucks and boosts as well as the giant lightning-induced spikes. Damage to the downstream gear is my only real concern.
Casey