I got my Ion last nite, first impressions are pretty good.
Just a point of note, when you strip the gun and come to reassemble it, make sure the front vertical screw (the one directly below the barrel) is screwed in straight and sits flush with the body.
Mine was at a very slight angle, and as such I couldn't screw the barrel in and scratched the barrel too. No big deal with the stock, but doing that to a nice new boomy or something would end in tears!