I haven't read the Twinstar article being alluded to, but I was one of a number of people lucky enough to be invited on one of the pre-certification flight tests of the aircraft.
Whilst Diamond are a superb company in many ways, they do tend to hog the left hand seat of that particular aircraft, and the invitee is given a certain amount of "hands-on" time, but never enough to do the job properly.
I wouldn't have wanted to have to write up a flight test on that basis, but what I saw, I enjoyed a lot.