I've used the 5.56 variant and enjoyed the hell out of it, but when I was looking at my .308 due to using the POF before I was leaning towards it, but for the same price of the POF, I got my Longer barrel and upgraded trigger in my sig for the same price, And I to have heard mixed review on them, I wouldn't mind one of their sbr's but probably would end up getting something else due to personal preference. They Are fun rifles that is for sure!
Also the first rifle to make me swap over to piston over DI