You will love it...
Sanitaires are great!
Be prepared for a more "vigourous" vacuuming experience if you haven't already used a vac with a Vibra Groomer II in it. Depending on how sound your floor is, you may find that the Sanitaire will vibrate it like a sounding board in certain spots. It can be loud! Sympathetic vibrations can really shake the floor.
I had a curious problem with my Sanitaire where it would suck/clamp onto the carpet, and as I would push it forward, it would release, suck, release, suck, release, suck onto the carpet. Kinda an oscillating effect of sucking and releasing. I couldn't figure it out for the longest time as my other Sanitaire wasn't doing that.
It came down to the belt being worn. The brushroll still spun and there was no burning smell, but something about the airflow, the suction, the worn belt, and the compromised speed of the rotating brushroll contributed to that strange effect. It disappeared once I popped in a new belt.
Enjoy your new vac!