The Dysons have a very poor reliability reputation Lizzie and yes, I can well beleave that an early one could catch fire as they regularly burnt the motors out (I hope/think Dyson finaly fitted thermal fuses in them like every other manufacturer on the planet to stop/reduce this).
I have said many times, the best bit about them is the marketing and the best bit of marketing is the clear dust collection vessel.
They did do a lot of good in bringing innovation back to the market and were the first to use multi horse power motors which is the key thing that got them a market lead (this being the main reason why people noticed such a huge difference to thier old units) but, the market has moved on a lot and way overtaken them.
Being one of the early DC04s, I can confirm that mine has always have a thermal fuse in the motor - that was the first fault Dyson fixed under warranty
I would assume they have used them ever since, esp as even the pikey chinese replacement motors for less than £20 have them fitted
Anything with 240v with some current capability running through it has the potential to catch fire quite spectacularly. So the lovely girlie with the tight t-shirt and big hooba-loobas from the fire service was explaining, after the horse had bolted. Though I wasn't paying too much attention on what she was saying, I needed all my skills to not dribble.
I think in the 90s, the reason everyone said Dysons were the mutts is because it was the first time in ages when people binned their old cylinder vacs and went back to uprights, with carpet beaters/brushbars, which are obviously more effective.
I think, as an upright, they are better than average performance wise (if "serviced" properly), but made from some bloody shoddy materials.
Would I buy another? Based on the experiences I've had with this one, yup, Dyson would most definately be on the shortlist.