Just got back my gun back from the Springfield Armory Custom Shop. It started out as a Nighthawk Custom T3, and has had the entire top end replaced. They even threw in a few goodies for free that I didn't expect, like re-profiling and re-finishing my thumb safety (didn't request it). I had originally wanted a T3 in 9mm, but the wait times were a no-go for me, so I had the T3 in .45 converted instead.
Only two complaints. They hardchromed my extractor, which I specifically asked them not to (it's an Aftec), and the bushing and bushing/barrel fit is Baer-like tight. Not a little tight, but puckered-up-butthole-on-a-scary-roller-coaster tight. Other than, I'm very satisfied with their work.
Quick update, the extractor was bead blasted, not hard chromed as I originally thought.