I've had my Dyson upright for probably nearly a decade now (or at least 7-8 years that I can account for at minimum). It started off as a vacuum for a retail store I owned, and was used every single day for about an hour solid, for about 4 years, until I sold my stores... and has since been my home vacuum being used weekly. I've never had it break down, or any parts fall off, and it still works better than any other vacuum I've tried.
Maybe I just got lucky, not sure, but I've been very happy with mine.