At this stage in it's life I'd have to echo this statement. Ours replaced a "Neff" (same as Bosch in all but name it appears) however that was only a few years ago or so the Miele has got another 6 or 8 years to go.
If it lasts 20 years without any problems then the higher price for apparently less effective cleaning might balance up. That said, the Aldi dishwasher tablets I'm now using have bought it up to being on a par.
Perhaps the "Finish 4-in-one" tablets I always used in the Neff became crap right at the same time that the Miele was plumbed in but I doubt it as there was still 1/4 of a box left at the time.