We have this Dyson and it ROCKS!
My in-law's gifted us with it for Christmas/Holidays a few years ago (um...is that a hint, MIL?) when we lived in a condo in Athens that was carpeted. In full agreement with all the other testimonials here, it made a HUGE difference in our carpet from the very first use. Maybe *part* of it is psychological, as I watch every particle of dust, fur, and junk visibly swirling around inside that magnificent clear whatchamagig that captures the dirt. But either way, the thing works!
We have since moved to a home that is all hardwood flooring, with the exception of one very shaggy carpet room and one limestone kitchen. We continue to use the Dyson animal vac and it really, really works. The attachments work beautifully on our sofas and UNDER furniture where those lovely tumbleweeds of fur love to reside.
Highly recommended!