Ive tried all the commercial vacuums and still believe it or not, the Bissell Clean View is my favorite. When its brand new it sucks like crazy, actually really impressive suction for a vacuum that goes on sale for $79.
Its really easy to keep the filters clean and when it starts looking a little beat up after 1 busy season you just throw it away/give it away and get a brand new fresh one.
I prefer it over sanitaire sc99, any kirby, pro team, oreck, or dyson. It digs deep.
Plus vacuums are so nasty after 1 busy season I dont really care to take them apart and spend time getting the smell out and all the gunk.