We have the Dethleffs 4 travel 6966, which is identical physically but with different trim.
No problems with the Dethleffs bit, apart from the Dometic fridge which is imho rubbish. The Fiat bit has had a few niggles but nothing too terrible.
We love it. Loads of space, huge garage we never fill, the bed is fine. At least, the main bed is. Ours was sold as a 4 birth and it isn’t really. The extra two are made up origami style with a zillion bits and are pretty uncomfortable when they are made. Ok for kids possibly but not for grumpy grownups...
It’s quite heavy. I forget the numbers now, but I took it to a weighbridge when we got it and it was I think 70 kilos over what Dethleffs stated. Ours is rated to 3850kg and loaded up for two weeks in France it’s all of 3650.
The build quality is good, but not this perfect Germanic stuff you read about. I’ve fixed 90% of the rattles but a few were tricky.
One thing though. We were idly wondering what to do next and we looked at a van we quite liked at a dealers the other day. He gave us an indication of what we’d get on trade in for the Dethleffs and to say it was disappointing would be an understatement. I know it was only his opening salvo but even so....He claimed they were hard to shift, an unpopular layout and so on. Twaddle, I reckon - there are other examples of this layout around so I’m inclined to think he just didn’t want to take it for some reason. Might be worth just bearing that in mind if you’re talking money with the seller. Perhaps don’t pay top dollar?
Ps we leave the duvet on the bed and squash it against the ceiling. So the bed is ready made apart from slinging pillows on. Think it’s brilliant, best of both worlds: made up bed like a fixed but takes up no space during the day.