Just popped this into my M9 with Hogue overmold grips. I've got big hands and dropping a mag with the factory button wasn't effortless. With the new oversize steel button it's incredibly easy and fast.
Installation was a bit of a pain, definitely watch the video and follow the same angle "trick". While the all steel part has less give to it, it should pop into place eventually.
This part is a must for me and I definitely recommend it if you're using thicker grips.