I think you'll be sadly disappointed if you buy a new Dyson.
My wife and I bought one about a year ago. It was great for a week, but now suction is average and we are constantly having to remove and clean various filters to get it to work well.
I suspect Dyson did use to focus on quality, design and longevity but that a few years ago they started selling quite average vacuums but still charging a premium for their "good name".
FWIW, I bought one in Nov 2012 and have been delighted. Not a clogged filter or any other issue in that time. Not saying Dyson's are the best vacuum you can buy but it's not as if your experience here with a later model is unanimous.
My wife and I bought one about a year ago. It was great for a week, but now suction is average and we are constantly having to remove and clean various filters to get it to work well.
I suspect Dyson did use to focus on quality, design and longevity but that a few years ago they started selling quite average vacuums but still charging a premium for their "good name".