The Sigma series was designed when the mindset for law enforcement and self-defense guns was that a long and somewhat heavy pull that replicates the DA pull of a revolver or wonder-nine hammer fired gun was the way to go.
I shoot everything under the sun. GLOCKs, 1911s, Rugers, Walthers, Berettas, SIGs, S&Ws, Colts, etc... DA Revolvers, SAAs, DA/SA autos, SAOs, DAOs, etc...
Shooting the SW9F is like shooting a DAO SIG before the SRT/DAK kit.
Hell, my SW9F surprised so much, I went and got a SD9VE to accompany it.
Is the Sigma the best gun out there? Nope. But is it bad? Meh, for under $300, I've seen far worse guns that are more expensive. The Sigma in that category is a good deal. It puts 9mm where I want it at a self-defense distance and it does it reliably.
Will I be using it as a three gun pistol for nationals? Hell no! But it is a pistol of a bygone era and makes turning money into noise, fun, in the same way that watching your favorite b-movie slasher flick is fun.