In message , Andy Hall writes
Indeed, my experience is that the suction stays pretty constant, until a point where the filter gets too blocked, and then it rapidly goes down hill.
In 'normal' use I've not found the filter blocks quickly (or even at all in fact), but fine plaster dust will do it... :-)
We've had 2 and both have been reliable, a DCO2 which was so nice that someone nicked it, and a more recent DCO7. I much prefer the newer filters as they are washable though.
As for braking, well ours have both passed the bounce down the stairs test.
I certainly think that the cleaning performance is better than the Henrys I've used.