We have a Bosch dishwasher that is still going well after 9 years.
The only thing that has gone wrong is the spring on the tablet dispenser so we have to remember to throw a tablet in when the cycle says 79 mins left! We will probably get round to having this fixed at some point!
Bosch but don't go for the cheapest - ours is under a year old and build quality not great. Made of thin steel and baskets catch when they slide in and out. My Mum has the next model up and it's much better quality.
A few weeks ago we thought it had gone wrong so called out the engineer, as it happened it was nothing wrong with the machine just DP's attempt at plumbing(he's an accountant FGS, not a plumber) and he said that he never gets call outs for AEG products, that they are very well built and, in his opinion, better than Bosch.
Cool, thanks all. After I posted this I joined Which? (they do £1 trials) and it is ace. They do the most rigorous testing and they seemed to be in favour of all the ones you have mentioned (the Bosch ones and that Electrolux one, plus Miele all got the thumbs up). Good to get the low down from MNers tho, thank you.