Well, just half an hour ago I used the 2012 Vax Performance 1800 Watts.
Lets just say, it sucked.
No, I mean literally! The suction is absolutely astonishing, not just for a bagless, but for a vacuum as a whole.
I used it for the hard flooring and the shag rug. During both of those tasks it performed brilliantly and followed me wherever I went without having to really tug at the hose as you do with some cylinders.
At times the floor tool stuck to the rug and would barely lift off, that is how much suction it has.
Compared to my other 1800W bagless cylinder, the 2004 Panasonic MC-E8011 Twin Bin, it has much more suction. Perhaps that is because all the suction is centred on one cyclone instead of two as in the Twin Bin, but whatever it is, it is great... For a bagless...
In comparison to the Dyson, the suction is about double and I'm NOT just saying that because I dislike Dyson, it is the 100% wholehearted truth.
The only thing it lacks is variable power, which would be a real asset to the Vax, but hey ho, it is cheap and cheerful and does what it should, so I'm pleased.
Doesn't mean to say I'm a bagless convert at all, but I can appreciate a bit of both.