Looks like a nice unit.
I have a APC RS1000 that has served me very well for the last 4 years without a problem. Soon, this will be relegated to entertainment center use and I'll buy a new one for my computer system. In my computer configuration, the RS1000 would keep my entire system (21" Dell monitor, 650watt PS, wireless router, cable modem, and 5.1 surround sound) running for 20+ minutes in the event of a power failure. It would then shut down the computer if the power was still out.
My parents have an APC unit similar to the one pictured in your post on each one of their desktops in their office. It'll keep either of the desktops runnin' for around 8 minutes before it'll automatically shut off the desktop. If you're there, it'* enough time to save everything.
I would have to say that if you are considering purchasing one, run the laptop and the HD on it. It'll just prolong the life of your power supply for the laptop and ofcourse, keep the HD from getting wasted. For the two of them, you're probably lookin' at 20+ minutes worth of backup power. For a blown breaker, you wouldn't even have to unplug or shutdown anything.