I currently own the blue RSL4 Riccar Supralite (top-o'-the-line model), and I used to own an Oreck xl21. I got the Riccar first, and I really loved it, but I always wished it was just a little quieter. Well after hearing Oreck boast about how quiet the xl21 was (they claim you can talk on the phone while using it), I excitedly bought a used one.
The xl21 was clearly the most powerful lightweight Oreck ever made, but overall (since I already owned the Riccar Supralite), I was disappointed. What upset me the most about it was that even though it was soooo much more expensive (we sell the TOTL Riccar Supralite for $289.95, but they retail for like 500 dollars or something... which really is just too much money to ask for a vacuum like that in this part of the country), it simply did not clean as well as the Riccar. It did better than the other orecks, but still not as well as the 8-pounder I was already using. At the end of the day I want the vacuum that legitimately cleans the carpet.
Also, the Oreck xl21 is not nearly as quiet as I had thought it would be (hoped it would be). You totally could not talk on the phone while using it. It was quieter than a standard whiny Oreck, but not a quiet vacuum by any means.
I sold the Oreck on ebay a month or so after I got it.
Orecks are incredibly popular because David Oreck is a marketing genius. I bet he could sell sand to people who live in the desert. The Riccar Supralite will never be nearly as popular as the Oreck is, but it will always be the superior vacuum.
Corey