Sparky I get it, you like good parts. I do too...
I personally know a respected race engine builder that has used Scat in LS motors that see occasional drag racing. One in the 600, the other in the 800 hp range. AFAIK they've held up just fine. They do require precision checking and machining.
Do they balance out ok? You bet.
Like others have said, would I use it in an extreme duty/max effort or road race build? I personally wouldn't.
Are they OK for a street motor? Sure!
Everyone has their opinion of parts. Vote with your wallet.
Just my .03
Can 'o worms warning: Aren't Compstars and Dragonslayers made in China and finished here? Those are in many, many builds over on LS1Tech.