I've tried the Shield 40, and Glock G27 which is 40 also.
Now I carry a CZ P-07 in 9mm.
I've decided that striker subs chambered in 40 aren't for me.
I like the DA/SA w/de-cocker in a compact size 9 a lot better.
It may not be perfect, but for me right now, its pretty dang close.