The ambidextrous ejection feature is on the upcoming ARX100. I still have to get used to the weapon having no bolt release after it holds open on an empty magazine. It will not release after the magazine is released and you have to rack the charging handle again to move the bolt forward. I will have to play around with it some more to see if there are any other eccentricities. Work gets in the way of fun. So far, field stripping it is very simple and very quick. The buttstock sticks a little bit when adjusting for length, much like the SCAR, Sig522/556, but I suspect it will loosen up in due time. I am also weary of the tab that holds the buttstock in the folded position. Since it is polymer/plastic material, I am not very confident about its longevity. I wonder how long it will last without shearing off or eroding from continued use.
I paid $550 for mine. It is indeed light, but a little front heavy. My impression on build quality is pretty good and not at all cheap. The charging handle can be removed quickly and moved on either side of the weapon. Unlike it's bigger sibling, the direction of ejected cases is not alterable.
I bought my son his own .22 rifle a few months back...a Sig522. These things are reall fun to shoot and cheaper to boot (at least cheaper than 556s and 223s. We loved them so much, I just bought a Beretta ARX160.