I ask because that question is apparently un-Googleable spam-bait, drowned in snake-oil.
I have a Back-UPS CS 350, and I think it's the third one I've had. They are apparently shit, but it's the only model that Central stocks, which means I get to avoid the zillion dollar shipping charges since they're so heavy. So hey, it doesn't work, but at least it's cheap?
My new iMac arrived, and upon swapping it in, now the UPS starts screaming at me every time the CPU gets loaded, which presumably means it doesn't feel it can keep up -- but the only thing plugged in is the iMac and a bunch of tiny things like the DSL modem and USB hub, so it's not like I can do anything about that.
Maybe this means that the less-than-a-year-old battery is dying already, but I strongly suspect endemic fuckage of this model of UPS.
I could just order the cheapest thing Amazon sells that has twice the power rating of this piece of junk, but I suspect that the Lazyweb has more nuanced opinions than that.
(And yeah, the power does go out at my house often enough that I need one.)