I have two STI's, one is the now discontinued Spartan in .45. The Spartan was lower priced option as the frame and slide were manufactured in The Phillippines and assembled using STI internals.
Now all STI guns are made in the USA.
The other is a Trojan in 9mm. The Trojan is a very accurate, soft shooting handgun and it feeds any ammo I have tried. The only thing I would change is to eliminate the very heavy front cocking serrations on my Trojan.
STI is a great little company located in Texas that makes excellent handguns, buy with confidence in their products.