If you are looking for a polisher and can't afford something like a Porter Cable, I recommend this for the same price (and its an actual DA Polisher):
http://www.harborfreight.com/6-varia...her-69924.html
Now I'm not the type to usually recommend anything from Harbor Freight, but I have a couple of friends who have these and they love them.
Again if you are on a tight budget it's something to think about. I would avoid that drill based system. The pad area is small and I would imagine holding a drill attached to that system would be awkward after a while.
At least with the HF DA polisher you can use regular pads such as Adams, Chemical Guys, LC, etc..