I purchased several vacuum cleaners, over the past year, the previous being a Russell Hobs cylinder offering 2000W.
I found they were all terrible (we have 2 cats). They lost suction within days, and the hair remover tools jammed up in no time (Yes I know how to clean the filters etc).
I then decided to buy a dyson DC14 second hand off gumtree for £60.00.
Best bloody purchase ever, its effortless cleaning, brilliant suction, cant go wrong.
I am not a dyson fanboy at all, I have heard Miele are also very good.