I've seen that very model too.... I was searching for a machine polisher last year, and saw this on sale for $80 (Cdn) and although it was reasonably powerful (2.6 amps I think), it was HUGE and so is the 10" pad. Also, you're limited to 2 speeds and not terribly fast ones at that. I passed.
Even though the Porter Cable is significantly more expensive to buy & equip, I just couldn't bring myself to "cheap out" this time simply because all these other machines simply had too many compromises. Some were too bulky, none were both fast AND powerful, speed settings were limited, etc, etc. I finally came to conclude that the Porter Cable polisher was almost a perfectly adapted animal for the job we need. (I say "almost" because its baseball bat-like body makes for a poor grip if you have smaller hands.) Smaller pads about 6" in size are handier IMO because they can do smaller areas than the big 8" or 10" pads can.
It's great if you enjoy detailing and think you'll continue to do it over the years. It's a big sweat saver, and is the closest thing to a circular polisher us hobbyists can use while only half-awake.