KickassVacuums

The SEBO Felix is a great upright machine. It not only is very easy to carry up and down stairs thanks to its long side handle (where the hose is stored), but it also is great on hardwood and bare floors. It comes with a great parquet brush which does a fantastic job on your hardwood. Also the neck of the machine is great, it rotates 180 degrees, giving you a lot of flexibility to get under beds, couches, tables, etc. As most upright models do these days, it has an instant use suction hose as well as a nice light that will illuminate when your brush roller isn't at an optimum height to clean your floors. The brush roller can also be turned off to clean your moor delicate floors. It is fairly lightweight and is also pretty sleek looking and doesn't take up much space. I highly recommend the SEBO Felix models as far as upright vacuums are concerned.

Are you positive there is no clog at any point in your machine? Check underneath, near and around your brush roller.

for commercial use i would recommend the pro care 15 commercial vacuum. It's a heavy duty two motor machine that used to be manufactured by electrolux. It's a sturdy build and is fairly quite while running. Also the bag change is very simple and it has a fully automatic carpet height adjustment. The pro care also comes with a built in "performance indicator", alerting you of a full filter, jammed brush roll, air flow restriction, and things like that. It is a very solid vacuum made for commercial use.