I don't have a vacuum myself, so I have to borrow my uncle's every week. He lives just next door, so that is convenient.
Anyway, Dyson DC15 is a *really* strong vacuum cleaner and I assure you, you'll be surprised by the amount of dust, hair and scums you have in your house! Every week it just suck up this huge amount of dust I never knew existed. You can actually really see the difference. When you vacuum pass an area, you can see the carpet turning slightly lighter in colour, especially if you haven't vacuumed in a while!
The best part is, you can vacuum wet area like the bathroom and kitchen. The filter change? Simple. All the dust is trapped in the container, so all you have to do is take out the container, empty the dirts into a bag, and wash the container! Too easy and clean!! You save on buying filter bags as well!
The only problem with it is, it doesn't have a hose, so it's a bit of a problem if you're looking into vacuuming areas like in between cabinets, on top of surfaces, etc.