I have had a Dyson upright for ten years now. Loved it in the beginning so much so that I convinced my Mom that she needed one. The difference was hers had the ball and mine was right before the ball came out. The low level canister is my problem. The DC39 was a gift from my husband for Christmas. He saw me looking at them and thought all the reviews where praising this one the best. I like it and would recommend this to a person that is shorter than I, but I would prefer another upright.
The upright takes up less storage space in the closet and it is working in front of me, instead of dragging behind me knocking over what I am unaware of. I would swap it, but I fear my husband would get... I keep looking at the new updated Cinetic, but the price tag is a deterrent.
As far as suction the machine is wonderful, but our longhair clogs the small opening. After a few cuts with scissors, the hair is freed and sucked inside with all the rest.