Core M4 Piston AR, should I or shouldn't I, that is the question?

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I tried a search but I am not real computer literate so either direct me or add something new.

I am looking at picking up a Core M4 piston AR, this one:
Complete CORE15 Rifles :: .223/5.56 :: CORE15® M4 Piston Rifle -

I read others reviews but not real helpful. I do not need or want its junk buy a ***** but honest help for a brother. The AA piston system, coating on the M16 BCG and dry lube on the upper, SS barrel 8 twist, I understand they have many Daniel Defense parts. It feels light and nimble for a piston on par with a gas system. I read that the sight on the block over the piston can get, do not touch hot.

Cons and pros please of the weapon and a piston system please?


Thanks