After a years worth of use, I'm personally sold on the Dyson.
The vacuum cleaner has seen use at least once a week for the three floors. Have hardwood floors on the first floor and it really does work well. Usually use the wand feature to pick up the larger pieces of dog hair first, then use the vacuum to clean everything else up (and believe me when I say we can get some dog hair). Upstairs and basement have carpeting, and no complaints there as well (those two floors off limits for the dogs, so it's not as bad per dog hair). Will even load the vacuum cleaner in the truck and take it to the office and it works well on "industrial carpeting" that can see some heavy use.
Every once in a while I'll take the cleaner outside with the air hose and give it a good cleaning.
So far, no problem with any of the plastic parts.
I know warranties can be smoke screens, but per the form I have on file, it states "Your Dyson is covered for parts and labor for 5 years from the date of the purchase. If necessary, we'll arrange for your vacuum to be collected and repaired at no extra cost". Haven't had to use the warranty, but curious what will happen if I have to.