I liked the Dyson a lot, but it was a bit too heavy for me... So I got the Oreck. Very, very lightweight. I remembered we used to use them when I was a housekeeper. I have no complaints with the Oreck. In fact, I love them. Easy too maneuver, pick up well, store well, and are just great.
I've used central vacs as well from when I used to clean houses, and they work well, but the hoses used to drive me crazy... I prefer dealing with a cord, then the hose. Just my personal preference.
If you're looking for a strong powered, long lasting, LIGHT vacuum, the Oreck is a great choice in my opinion. :)