STI is a small manufacturing operation in Georgetown, Texas. This was, originally, an association with SVI but that fell apart.
STI started building race guns. Frames and components are first class.
I own two, Trojans. They make a classic single six also.
Wring all of them out, test their mettle, you bet.
You can get them in 9MM, .38 Super, 9X23, .45.
Fit and finish are good--hate the plastic grips, but I have never had a pair of factory grips I cared for--from anyone---especially SIG.
They make a long-slide, commander and several specialty guns.
They rank right up there with SIG in out of the box reliability and accuracy.
You can easily order and converse with them or there are two local dealers, Brazos custom and Dawson Precision (who I use) and these boys know what they are doing.
I have a friend who was given a race gun built by Dave Dawson for his birthday--he loves it.
SVI will allow you to build a gun to specs and I would love one but the STI does the job I want for less,
Blessings