I've owned three Dysons:
I first bought a DC07. I traded it with one of my friends for a car (as much as I loved the DC07, I still came out ahead). I bought another DC07. When my sister needed a vacuum, I gave her my DC07 and bought a DC14, which I am still using today. I use it a few times everyday to clean up the messes the kids and wife leave all over the place. I use it as an upright and the three hand tools pretty regularly. I rely on it.
Dyson rated the suction power of the DC07 at 270 air-watts. Don't know what an air-watt is, but since Dyson rates all their vacuums in air-watts, I figure we can use it. The DC14 was rated at 250. Their most powerful vacuum now (the DC39) is rated at 275 air-watts. Their current uprights are around 200-235 air watts.
The vacuum featured here is listed at 115 air-watts. I would guess pretty weak suction. Its strong points are the it's light and small. If you're tight on space and don't have need for the most powerful suctions, this might do the trick for you. I'd say if you have a full-size house and kids, a bigger unit would probably make you happier.