The M2 model is NV Gen 3 compatible, but where is the line drawn with the ML2? I've heard it's Gen 1 compatible, but nothing about Gen 2.
It's not so much that the ML2 is not useable with better NVD's, but the CompM2 has (along with the switch settings) lens coatings which transmit nearly 100% of light in the IR/near IR portion of the spectrum. This gives a clearer, brighter image with genIII and better NVD's.
I hope that helps,