So the Glock I recently acquired is bone stock - and this one is going to stay *almost* stock - no stipple job in it's future - but it is receiving a few mandatory upgrades - night sights, extended slide stop & mag button, and a grip plug. I also ordered a grip force adapter set to try - the beavertail is one of my favorite features of the M&P pistols, along with the more comfortable grips compared to the Glock. GFA is sold as altering the grip angle in a non-permanent manner, plus adding a beavertail. Lots of videos and articles out there on them, but I've not seen one in person to try. I figured they're cheap enough to try and see if I like 'em or not. Anyone on here have experience, positive or negative with them? Any "hidden features" to be aware of?