^^ Yeah, it uses few resources when running because it does nothing at all. You should try different products before supporting one.
Bro, what makes you think I have not tried the others?
I picked Diskeeper from the big 3 because it works perfectly for me, and I don't have to bother with defragging. It's automatic, and does everything to my satisfaction.
PD is okay* if you can live with it's slow speed, but I am not interested in running weekly defrags on 2.5TB++ of my HDDs. It's not an auto defragger by any means. In the manual mode, it's too slow, and takes ages just to analyze my drives. I don't like the interface either.
O&O seems to be like the one in the middle... bit of everything, but it had serious problems with Vista at one time (maybe it's solved now; haven't checked).
* Recently PD trial version corrupted my friend's Vista SP1 after running smartplacement and boot defrag successively. Most likely just a freak occurance, but I am not risking that on my system lol.
Moral of the story: Pick whatever works for you, but don't knock others' choices.