I like this set. I don't know if immovable catapults like this are historically correct, but for me it looks ok.
Besides this it comes with one of the better parts selections of all the little US-only sets. Two minifigs, three green plates, grey 1x1 round bricks, some black parts. The only part I rarely (never) use is the large turntable (have way too many of these). The blue Dragon Knight figs ("blue Black Knights" just sounded too stupid...) are among my favourite Castle figs, and they are kind of rare, at least rarer than their red counterpart.
This is just the sort of nonsense up with which I will not put.