One time, a long time ago, when the youngers were into the airsoft scene I tested out one of their full auto M-16 look alike guns. I was pretty impressed with the thing. Those little yellow plastic pellets will raise a welp on you if you're to close. Throw in there the full auto aspect and it was just plain ole fun. One of the youngers says see if you can hit me and took off running. He was thirty-ish feet away when I zipped a string of pellets up his back, not knowing what they would do. After several minutes passed he had a string of whelps running up his back. Big bummer, I would have never done that had I known. The only good that came from it was a learning about how easy it is to hit something, running fast, as it was. Also, it gave a good approximation of a fully auto weapon.
A few years ago they finally settled the issue of the FRT(Forced Reset Trigger) and declared it a semi-auto function and therefore, also declared it legal to own.
Did I buy one? You bet you azz I did. I bought, what I deduced was the best the market had, a Rare Breed. Correct or incorrect in my assessment, that's what I got.
Dropped it right in. Test fired it.
Did it work? You bet your azz it did.
Was it a blast? You bet your azz it was.
Did it approximate a true full auto? Never having shot a full auto, I can't attest to that but I would imagine...you can bet your azz it did.
Will it break the ammo budget in short order? You can bet your azz it will.
Would I recommend getting one? You can bet your azz I would.