Just noting I picked up a Dyson 'narrow' for a reasonable price at Harvey Norman and it's doing a great job. Our apartment has floor area of about 30m2. The Dyson does that easily on one charge.
The first clean filled the Dyson twice, the carpet is visibly lighter in colour (as is the couch) and hay fever is much reduced. It's a huge improvement on the old vacuum.
Being compact, wall mounted and cordless it's very easy to pick up, use, empty and and re-dock. Where as the old vacuum - you had to wrestle out of a crowded cupboard and it was a messy PITA to empty.
Because the Dyson is easier to use it gets run around more frequently.