I can't speak for the rest of the mods, but I personally would like to keep this thread at least relevant for the next few months, as this might be a great advancement for any M-series weapon, on which many scouts/spotters filed. I, personally just picked up on of these 1 week or so ago, but haven't had much time to tinker with it.
As on now, the only major downfall I have with this is this LED unit. And, I don't have a problem with the LED unit, and in fact I think this is quite an awesome feature (especially since it's about $50 less than most) itself, it's the fact that it wires into the the AEG battery, which wouldn't be a problem, but it lacks a toggle switch. If you have the know-how, which is infact as simple as a solder job and a mini toggle switch, then it is awesome, but aside from which, in my opinion, is a major downfall.