A word of warning...
I had a U1104. I experienced long-lasting drive belts, but at the expense of the belt pulley wearing down quite quickly.
With the older round belt machines, the belts wore down quickly, but the belt pulleys lasted well.
I also found that the plastic fan didn't quite generate the same amount of suction as the older metal fan Juniors; i.e larger grit particles simply rattled about in the agitator cavity, whereas older machines sent them on their way with a "ping!".