i have flown both the electric version and the ic version and they are both great, slow, stable and forgiving.not to much in the way of aerobatics though.
they are not fast and i dont think they would withstand a big engine and steep dives if thats what you are thinking.
i built one for a friend in the club(electric) and it was done in about 3 days of work(could be less if you were in a hurry).
nice model