A vacuum being 'satisfying to use', to me would be..
Easy to get out, easy to manuver, easy to hold, easy to empty and/or attach tools (attachments). AND, when you're done, you can see a beautifully cleaned carpet...proving your efforts were not wasted.
For ME, everytime I get a HOOVER out, plug it in, turn it on, i KNOW I'll hear that "hum". I KNOW I'll see those tracks, i KNOW when I'm finished, I'll once more have a nice clean home with proper lines on my carpets.
That's "MY" definition of satisfaction.