I just purchased a used DC14 for $150 off craigslist...I'm in love. These things SUCK! For what they do (and they do it extremely well), they are fairly simple machines.
The guy I bought it from was some sort of vacuum freak, he had owned a $1500 Kirby and one of the ball-type Dysons, and he was selling his "extra" DC14, which he still continues to use. From what he told me, he was as pleased with the results of the Dyson as he was with his Kirby, and that he felt the DC14 cleaned as good or better than the ball vacuums, and that any maintenance/cleaning was more difficult with the balls due to the amount of parts it is built with.