i had a yellow Aria with variable speed control - had it for many years and sold it on. The pull out filter grid is a great design though and Hoover eventually repeated similar design aspects with my other favourite cylinder, the Telios but not as well built. Quite a quiet vacuum, the old Aria and well made due to its weight. Only thing that I wasn't too keen on was the sheer size of it and for having the two castors on the underside with the fixed wheels at the back making it quite to control/steer.
Infact the Aria reminds me of an old SEBO C2 I have in the garage.