You'll probably get a few opinions on this, but I don't like the design of that sander. I'd rather have something like this-
D26456 5" Low Profile Random Orbit Sander | DEWALT Tools
It's lighter and easier to control. The quality of the paper used has more impact on how quickly and effectively the bottom can be stripped than the specs on the tool.
My experience with stripping bottom paint is that a 1/4 sheet sander loaded with quality sandpaper is the quickest and least tiring approach to take Cut down your sheets of paper, load them on the sander 3 at a time, and start sanding. As your sander clogs up, tear off a sheet and keep going. Buy a decent sander with wire bales and you're good to go.