Looked at the X3 page, the X3 uses the fusion technology, so guessing some of the features on the X3 are going to be on the M+? If I had more time, I'd cross out the M+ data points and just guess from which ones are left over.
Or maybe it's more accuracy?
Or maybe chipping/pitching related.
Don't even know how to describe it, but I open up to play a flighted wedge that will hop and stop. just let the hips and legs provide all the power, with the hands simply hinging and unhinging, naturally to a low follow through..
Most wedge shots I will play with a square face to simplify alignment, and I will change my 54 degree (my workhorse wedge) from a 10 degree bounce RTX to a 14 degree Vokey when facing very soft conditions or a very lush course.
I will intentionally put draw spin on a wedge into a good wind, or when the pin is well left and I want to get a good bounce and a bit of run upon landing or on a shelf I don't want to fly to then suck the ball back onto the lower level.