I just picked up a vp9. I really have enjoyed the p30 so I have been meaning to pick up a vp9. Hopefully some more sight options start to become available.
On a side note, when I rented a vp9 and was attempting to do some malfunction stuff with spent cases( normally use snap caps) it would feed and camber them no problem. Now it does not matter to me if a gun will feed empty casings because it really is not applicable but it still is kinda impressive.