Last weekend we went to my boyfriend's grandmas to paint. We moved the sofa and found a bunch of dust bunnies and other dirt so she got out her vacuum. It's a Panasonic canister with a powernozzle. The power nozzle looked rather big and it was really heavy. Once I turned it on I noticed the power nozzle would kind of jump forward and then jump backwards as you pushed it. The motor of the powernozzle would also change sound every time it jerked forward and backward. I said I thought something was wrong with it but she said it was supposed to do that and it was self propelled. She said thats why she bought it. The only self propelled vacuum I have ever used was a Kirby. That powernozzle did not feel self propelled. It just kind of jumped. It really didn't clean that well either. It took 2 or 3 passes for it to pick everything up. I don't know what model it was. She said she had had it for 20 years. It was brown and white. It was square with 3 speed buttons on top and it had a hose that swiveled all the way around. The powernozzle was big, quite heavy and had a full width headlight. I will say the vacuum was very quiet. My question is why would someone make a self propelled powernozzle? I mean how hard is a powernozzle to push?