I'Ve got the Dirt Devil Power Reach Multi-Cyclonic Bagless Canister Vacuum, SD40030
and I would never buy it again.
First of all, the 13 inch cleaning path cylinder who is suppose to catch all the hair and stuff on the carpet, always
get stock with human hairs and treads and it loose his capacity to clean very well.
I am really disapointed and hope to find something more efficiant, even if I have to pay more.

I'm not a big fan of cleaning but with a pet, you need something that'll work fast. This is a light weight, not expensive option, that is easy to quickly run over, in my case un-carpeted floors to pick up bits of dust, pet hair and stuff that blows in from the street. Not a great choice if you're fastidious, but it gets the job done quickly.