I was wondering if anyone has a new M&P full size with the new trigger in it, and if so what do you see as the difference compared to the older trigger.
I have a new M&P pro that supposedly comes with an upgraded trigger. Don't know if it the same one you are asking about though. The trigger on mine is nice for a striker fired double action, much cleaner then the trigger on older M&P that I fired.
Know any details about how new it needs to be? Mine is a compact that left the factory in late 2012. I have zero experience with earlier ones though, since I wasn't in the market then. I do like mine though, heavy enough not to fire accidentally under high adrenaline, but crisp and clean once the travel is taken up. The travel is the major problem, but you can preload it to the point where you feel the added resistance, then squeeze the rounds off. For me, I just had to alter my technique from shooting a revolver single action to account for it.