I have just purchased the Dyson DC35 cordless vacuum and on using it for the first time, as a little test, I was amazed by how much dirt and dust it picks up. The vacuum itself is lightweight, easy to assemble (attaching all the different tools, extensions etc.) and use.
However, the only slightly negative points I will make is that because it is cordless, the battery time is only 15 minutes on a full charge, which is fine for me as I only live in a small flat but I don't think it would be suitable for a large house. But saying that some of the bigger Dyson's would be great for larger jobs. Also on my first full clean, I found to get a bit of cramp in my hand from having to hold down the trigger for so long.
Overall this is a fantastic vacuum which I would certainly recommend for any small household.