
I have/had a Dyson DC05 Allergy - 2 year guarantee at that time. Bought it 15 years ago.
It broke down (my fault) and an engineer came out to fix it at a fixed price for parts and service of £60. He replaced, wand, hose and brush head and then refused to charge me anything.
When having some doors replaced and carpet laid, the fitter, without my permission, got my vac and broke the brush head. No more parts available so Dyson have just sold me a £299 new vac plus a 'power' brush head(cost £54) for a total of £80. It arrived next day.
I think that is great customer service.