I bought a Dyson vacuum 5 years ago or so for 1/2 price from a clearance sale. It has been one of the best vacuums I have owned. Was it worth the original $400 price? Probably not, but for $200 I think it was a good deal.
I paid almost double that ($700 US), and it is still definitely worth it. The product does much better than any other I've used, it's easy to clean, and it takes all manner of abuse. It's one of my favorite household tools by a long stretch.