Well I have one of it's older full auto cousins.

I am assuming here that the new ones are still using the old gas piston design. This certainly makes cleaning them a bit easier.

The obvious down side to them is that you are fairly limited as to what you can do with them. They just don't have all the available options of the AR15 platform.

One nice thing about the new ones is that as I understand it, they will take an unmodified M16 magazine. The older AR180s needed a special slot cut in them for the mag catch.

I just wish to hell that Armalite would make an upper and barrel assembly to fit the older AR18s. I really would like to have a shorty set up for my gun.