I don't know of anyone thats ridden the X-14V but all around I think it is going to be an awesome boat. My speculation is that it will have a wake similar to the X-1 so a little more vert than the X-Star and will have a phenominal ski and barefoot wake. Rough water ride is not as smooth as the X-Star due to a flatter hull surface. I have driven this boat and it will cruise through its own waves pretty well but not quite as nice as the Star.
As a pure wake machine you really can't go wrong with the X-Star, this is still my favorite boat in the lineup. Changes from 07' have pretty much been stated, the new interior looks a lot nicer in my opinion and I really like the VDIG, its not necessary but I like it. If you don't ski I would go the X-Star route.