Mine has the sight island barrel.
I live in Austin and work for an IT solutions company.. got myself and my boss one in as part of data center overhaul..
I have been using a Wilson Combat Spec Ops 9, great gun and zero issues, had it for years.. but the STI is easier to shoot faster and hitting small steel plates at 25 yards is easy.. was out this morning with a buddy and he was banging 2" steel at 25 yards and was grinning..
If I was going to do a full custom I would get Aaron Hayes of Hayes Custom Guns to build it for me, known him for years.
Having said that, I am confident that STI will take care of me if I have an issue.
I have been all through their shops on numerous occasions and spoke with the guys building the guns.
They all seem genuinely motivated to build great guns. The production manager came from Nighthawk and is driving to deliver consistency and tight tolerances.
Hadn't shot a match in several years and haven't been shooting pistols at ALL the last few years. Pretty much use suppressors for all of my my shooting, long rang, a lot of hog hunting with suppressed ARs and thermal, deer, etc..
First match last weekend, I was trying to shoot accurately over fast.. one practice session of a few boxes and off to the match.
The pistol stage I found a spot where I felt confident I could hit all the steel and went to work.