Well I just got my new CP850PFCLCD today and it's all hooked up, and I must say, I really much prefer this over a pure sine wave unit.
We've had this discussion before, but as I've said before on the other UPS thread, this thing is dead silent ( I can't reiterate this enough. I hear absolutely nothing.), it has minimal power draw, is incredibly light weight (15 lbs only), is incredibly compact, and is 3 times cheaper (comparing new to new. Got this unit for $115.99 final price at JR.com.). For me, this is everything a pure sine wave unit is not, and I really find great value in these qualities, which tend to be overlooked when shopping around for a UPS. But again, my demands are not mission critical and not paid by the minute, so of course I speak only for myself and those in similar situations.
And if it craps my equipment out, then I know I'm covered. As for data recovery, I've also got my Time Machine backup, so I'm good to go.
If things go south, I'll eat my words and report back here, but then again I'm using an iMac now. Though, I hope others here will continue to chime in on their Mac Pro experiences with the CP units, good or bad.
I'm simply going to by good word of mouth and an increasingly positive user experience, as evidenced by the retailers I've link above in a previous post. And unless I see cold hard evidence from tech sites, or negative user reviews saying this thing is blowing up their machines, then I really don't see why a pure sine wave unit is going to benefit some users, other than having complete and utter piece of mind. But that said, I'd be lying too if I said I didn't feel safe or I didn't trust the CP unit. So far, it works perfectly, and as advertised. And that's good enough for me.