I'm managing 95 apartments with single dish drawers, they are now coming up 6 years old and have been used by many different nationalities and surprisingly I would only have a serviceman come out once every 5 months to attend to one.
I had one of the first dish drawers in a place I built about 10 years ago. Absolutely fantastic!
I have purchased a 2nd hand LG for a place that we are doing up at present. Whilst its rented the LG will remain but as soon as we move in we will change it for a double dish drawer. I bought the LG as 2 servicemen recommended them as dishwashers they hardly had to service.
When I worked as a kitchen designer a number of clients wouldn't even contemplate a dd as they had been put off them by what they had heard from other people. But my experience with them is all good.