The size was something I noticed also, and I think that I would like it a lot. I like the style and feel of the invert mini, but I honestly don't really need that much gun, since I don't play tournaments, so I think this should compare to that style, that the mini offers. I mostly play woodsball and recball also.
I mostly play Rec ball and Scenerio games these days.
Actually last used the E1 at the Alein Agresshion 2 game in august witch was last time i played (been out of comission since september due to injury incurred by an old lady and her car). Its a good gun has no issues using it in the woods.
One thing i forgot to say bout the E1 is i love how compact it is. Even more so than my automags.
(here is a size comparison though now that mag is slightly different)