Miele makes darn reliable appliances, I've had two Miele vacuum cleaners from -88 and still both work fine. Used weekly, one at home and when I sold summer cottage to my brother & his wife I gave one to them, they still use it there.

All parts still available and when I bought new hose few years ago from service I asked if they still are willing to fix it if it went broke answer was. Sure absolutely, just bring it here and we make it work again. I've just bought once new floor nozzle that was worn out and that hose because it grew leaky from ends. Third party dust bags are available and very cheap.