I have the sigma 9ve also and at first the trigger was stiff and I had problems with my groups. I also found out that the sigma didn't get along with the 147gr ammo. I guess it's the small frame of the gun or maybe just me. But after shooting about 1000-1500 rds through it, the gun is working great. Right now I'm using the 115gr target rounds (cci, remington or white box winchester). And it works great with 124gr golden sabers.
I've heard mixed reports from other users. But I'm happy with my 9mm. It just took so damn long to break it in.