I got a new Shadow 2 a couple of months ago. Like night and day going from an M&P Performance Center 9L to a CZ. I shoot much much better than I ever have with any other gun with my Shadow 2.
I saw all of the "lighten this tune that blah,blah blah" and actually got the 13lb spring ,extended firing pin and return spring....................and one month later I haven't taken them out of the package yet.
1200 rounds later , my DA is nice and smooth and as someone else mentioned earlier in this thread, "I prefer a little take up with a nice crisp break, no surprises" . I have that now and am shooting better than I ever
imagined I could and getting even better by the day. I 've actually decided to throw the Apex forward set sear/trigger package into my M&P as that trigger (even for a so called "competition gun")
is horrid compared to the stock shadow trigger. Nice take up and crisp break , but the break is still over 6 pounds with 1500 rounds through it.
I've started USPSA competition /steel challenges/steel Plate comps/Bowling bin competitions... basically anything I can get too, and I improve a little bit more every time I go out.
Maybe at some point an STI, a real "race gun" would benefit me but right now...I'm not there yet. I think any SA trigger that is crisp with a 3-4 pound pull is sufficient for anyone to shoot accurately.
If it fast enough at that weight? I don't know I haven't been able to shoot faster than my gun allows yet, if I ever get there i will re evaluate.