RE: S&W M&P vs. Glock
I know what you mean by snap up and that was a big deal to me in buying the M&P. I too have the grips on my glock and it did make a difference but it still does not feel as good in my hands as the smith. My glock comes up a tad to the left when I bring it up and it makes me have to do a quick adjust.
What type of competition and what positions? I too used to shoot. Right now I mostly play around though and work on defensive shooting.