I so love my micromag, Pro Team makes some great stuff and are top notch.
I think the micromag looks so much better then the stock mag, however they shoot allmost the exact same, so if you allready have a mag why spend the money on something that is just for looks? I would get a nitrogen system or something. However if you allready have that sure go for the micromag. The autococker threads are nice, and so is the .45 frame (pull is longer yes but alot lighter, i love it).
The choice is yours.