It was a learning experience for me....
Everybody had me scared to do the drum sander so I started out with the 4 pad sander/grinder/polisher from Home Depot. I spent about 3 hrs and did 20sq feet or so and said screw it. I ended up getting the drum sander and it was good. I let my dad use it while I did the edges up stairs. I came back to find him running all over the place with it. I looked at the floor and couldnt see any problems. When I finally stained it I could see all the drum marks where he went back and forth. I got to redo it.
Moral of the story....
Rent the drum sander and the edger (edger is a must!). Take your time and do smooth strokes being careful to not let the drum sit in one spot for even a second. Its not bad, just time consuming. I did about 700 sq feet in two days.
Here are two before and after pics.