I strung on a prototype for about two hours in Oct. I think the only thing they were going to change at that point were the clamps, a good decision. It takes a bit of getting used to because, used correctly it is higher with a slight angle when stringing the mains and much higher and a pretty good angle when weaving the crosses.
The objective is to be more ergonomic and thus the stringer will be less fatigued. Did it pull it off? It was hard to tell with just two hours, but I must say, it was pretty sweet, and you really are standing more upright and not hunched over like on my Star 3. I have spoken with stringers that used it at the Open and they did feel it was a "better" stringer. When you get in the 6k range it puts it up there with the Sensor and the Technifibre. They will all do the same thing but the long term ergonomic features of the Wilson put it over the top for me.
Tod