I had '88 model DR750. It had 74 000km o´clock when I bought it. I drove about 20 000km without any bigger problems. Then I imported '94 DR800 from Germany and now she has over 50 000km o´clock. Both of those have been very reliable (like any DR´s).
The big DR´s really are big ones. They are smaller, lighter and easyer to handle than Africa Twins or Boxer BMW´s but compared to LC4´s they are monsters. Dryweight is about 200kg.
It´s not perhaps best bike for freeways or soft single tracs but I think that it is quite good compromise. I have been driven with it everywhere between swamp and single tracs to long highway tours with my girlfriend. My friend did world tour with DR800 and here is link for his homepage. There is also lots of information about DR800: