Im sure you will get lots of replies here, Ive got the Miele cat and dog vac but think It's about 7 or 8kg? Not sure how that compares to the Dyson?
I know people who have got one of the Henry range and love them - lots of reviews on Amazon.
I got our Miele from John Lewis and got an extended guarentee and Miele send me 5 bags a year and filters which is good. When we had a dog it got up all the fur and is good at getting up the rabbit fur when hes inside!