I have shot both the mac 11 as well as mp9 (both kwa) mac 11 sprays everywhere on full auto and isn't accurate on semi auto, if your using it in cqb and it tickles your fancy in the look category, then get it. If you plan on using it at all in field the mp9 is the same size and a bit more accurate, and if you actualy want a decent field primary get the kwa mp7a1.
Conclusion: Mac 11 sprays everywhere, it is a cqb weapon and anything past 60ft good luck.
Plan on playing CQB and field with it, do they make a low-power bolt for it like they do the Mp9 and MP7? When I play field though, I move in close while someone else covers me, and then bam, right in the face!
They make a low power valve for the mp7 and mp9 as well as a low power whole bolt assembly, the bolt assembly is more expensive but way easier to install compared to the cheaper valve.