My full size shoots very well once I got used to a gun with travel in the trigger. I used to shoot single action almost exclusively, it took a few hundred rounds to stop twisting the gun.
Zero failures of any kind so far in 450 rounds, stays dead level and settles right back where I want it. No modifications of any kind yet, I've been considering the Apex parts, but haven't taken the plunge yet.
Found a roll of leather in the house, am considering trying to make a IWB for myself right now.
Check brownells for the .357 sig and 9mm barrels for it, 3 guns in 1. (though you need new mags for the 9mm. )