A while back, I bought a 9mm S&W Sigma SW9VE for HD. I shot it pretty well, but I wanted to upgrade and bought a CZ75B. I shot the CZ better at the range, but I still could shoot acceptable CM groups with the Sigma, and I could actually rapid fire the Sigma better up to 15 yards.
Long story short, I kept the Sigma by my side at night, and I really like the flick ability of the lighter poly gun over my heavy CZ.
I sold the Sigma to my brother, and miss having a poly lightweight 9mm. So even though I'm not going to get a Sigma again, I'm in the market for another poly 9mm. I've been thinking Ruger SR9 for the last few years. I just need to shoot one first.
FYI, I use a Ruger SP101 .357 for HD for now.