I bought mine about a year ago, and have had it on my BCM 16 middy for that time period. I love everything about it except sometimes the weight as others have said, other than that it is awesome. I'll always have one available to me from now on. It is expensive and I waited like 6 months before pulling the trigger but as soon as I did and got it on my gun it totally changed the whole feel of the gun, its hard to explain completely but I think its totally worth it. I bought mine new but I wouldn't hesitate buying a used one due to the fact that these things are REALLY tough. A little side benefit of the additional weight is recoil mitigation as well, the 5.56 doesn't kick for shit anyway but my gun has the BCM comp, a middy gas system, the UBR stock as well as the enhanced magpul recoil pad, along with the weight of the Aimpoint pro really makes this gun not kick at all. Muzzle rise is practically nothing, excellent for taking new shooters out who want to shoot something fun without it killing their shoulder, or for double taps. Long story short if you aren't having to trek this rifle long distances or are in good enough shape where an additional pound doesn't piss you off I would look as the weight as another benefit.