It seems to fall to me this duty, in that I inherited some allergies so more in need to rid house of allergens the blessed carpet collected, held until full, with my thanks. (Same with litter box, in the day.)
So have been there done ALL that and even tested one against another on mostly Karastan, some sheet vinyl, some tile, some Berber.
Results in order:
1. RICCAR upright, the more spent, the better the machine & ease of use SewVacCity!
2. Miele Tango - found a Maroon deal on eBay, almost a Riccar equal, $99 brush only lasts 3 years
3. Hoover top-o-line bagged
The rest are many & omitted to save all the rants that might be released on each & every one that wasted time/money/frustration.
The Miele automatically adjusts height when you run it from one floor surface to another + Looooong cord, Powerful suction (ala Riccar) and thus Shames all bagless-less-than-$200 vacs ... IMHO
Short-hand answers here ... long-hand help here ....
http://pages.suddenlink.net/tgivaughn/