The AP flaps look pretty darn "VSD" to me (as in, fairly straight, not particularly suited to jumping anything more than X-rail height... )

I tried a Dressage model when they were first available, and the point billet was an issue, really restricting the loooong scapulars my kids tend toward.

The 500 AP looks REALLY interesting, but I'm wondering what the stirrup bar position is like. It *appears* the tree/seat are the same? I did very much like the seat...