I can't recommend Sebo. They are made very well, very quiet and good suction.
However, I found them to be extremely non user friendly and the worst cleaning power heads. They can't handle anything outside of a low profile rug. Anything with any kind of nap and you can forget about having the Sebo clean it. The brush roll circuit board turns the unit off right away. It won't let you use the vacuum normally.
So I have to definitely say, that if you want to use a vacuum normally and actually have clean results in the end then avoid Sebo!!
As far as Windtunnel T uprights, I've noticed that there are several different brush rolls for the units. Some use the "Dirt Devil" style brush rolls. All the tufts touch eachother, they're bleach white and cut short. Good cleaning but not a deep cleaning agitator. Some use a Hoover style auger brush roll. Small gaps between strong bristle tufts, cut long and groom and clean very well!! I would look for a model with the Hoover style bristles.
