Just something to the new owner of the Miele Dishwasher, the cycle times of most European models are much longer than their American counterparts. We have a Siemens and the cycle times on your machine is pretty much on par with ours, the turbo I would suggest is almost like a half-load wash, and cuts down on the washing time but on the results as well.
We usually leave ours on 50 (eco) with the final rinse at about 70 degree celcius, and for really dirty stuff we use the 60 degree cycle, with minimal problems.
Just set it and forget it. By the way I think the buzzing noise is something to do with the fill valve, our Siemens does the same.
Regards,