I wanted a P-1800AR unit, but didn't want to spend the money at the time, so I got the F1000UPS instead. It does the same task, plus a UPS battery backup, so my gear can remain on without power. With my Rack, iMac27, and 2 outboard monitors plugged into it, I can stay on for about 30 minutes. It has saved me from losing Logic Pro tracks that I'm in the middle of doing, and presets that I am constructing, at the time the power has failed.
Biggest drawback is the weight. This sucker weighs 43 lbs. Since moving my rack itself up and down stairs, is a PITA already, I keep the UPS in a 2 space rack by itself and lug that with me when I'm playing out. If I had roadies it would be inside the gear rack with everything else.........
I know an 1800AR is surely in my future.....eventually.