IMO, the Sigma is better "human engineered" than the Glock and fits the hand better. Mine is usually reliable, but one brand of ammo gave 3-4 jams per magazine. I don't think the gun is inherently inaccurate, but it has a poor sear letoff, and I tend to pull my shots. Off a rest and really concentrating, I can get very good groups. BTW, I am no novice; I have fired thousands of rounds DA from revolvers (S&W preferred) and many thousands more from various and assorted pistols, rifles and shotguns. I can cope with long pulls, hard pulls and creepy pulls, but I can't master that Sigma!