1) I'm glad they decided to make the charging handle actually open the dust cover.
2) Looks like the internals may even be better than the metal version, I do hope that this is true, since I think the metal version will soon become obsolete, thanks to KWA. (You could mention others, though I'll still say that I think KWA's got the best M4 on the market.)
3) New hopup unit, new motor, new internals... This looks like me to be one of the best options out there.