I have seen one on the road- it was a hideous bright Lime green colour. However, that aside, I think it looked quite nice. It certainly looks different to the old Disco II, and its noticable that it is lower. However it doesn't look much longer (it is only 2 inches more, I suppose).
We have owned 2 Discovery Is, and whilst they have been fantastic cars you cannot help but continualy notice that the chassis was designed for a totally different vehicle. They always looked a bit out-of-proportion (too tall, not wide enough, with Range Rover windows grafted into them and lights from the Sherpa van- a real 'parts-bin special!!).
The new is looks like a well designed, solid machine. I am pleased that they resisted the trend to cover it in chrome and flashy exterior trim (e.g new Land Cruiser, Shogun), and from the front it looked quite imposing.
Only the back view didn't work for me- the rear lights (way too big) and the lack of a spare wheel made it looks a bit bland, but that's about it.
The one I saw was a fully-badged TdV6 HSE, and it was stonking along the road at about 70-80 mph. It was being driven by a man who was staring fixedly ahead of him with a slightly manic look, like someone trying to land an aircraft in a dense snow storm. He seemed to be enjoying himself though.
From the brief glimpse of the interior I saw the beige/black trim seems to work well, and it looked very modern and up-to-date ( I only saw it for about 2 seconds). It had the very-rear seats folded down, and it seemed to have a lot of rear stowage space.
If the Disco III is as good as the reviews have said (superb on-road, jaw-droppingly-amazing off road) and all the technology works (and keeps working) then it probably is worth the money for a top-spec model- but would you really want to risk taking it extreme off-roading. Same problem as the Range Rover III- the world's best off-road vehicle, but it costs so much you would never want to get it muddy (well I wouldn't....)
Jack