Mine have been Warrens and Dawsons...
One thing that may affect GTG-ness is the rod itself. I have had some fiber rods that seemed more glassy and brittle whereas most of what I've used felt more flexible. Anyone have thoughts regarding durability of thinner vs thicker fiber? With one exception all of my pistols are running 1mm front. The 1.5mm on my XDs seems like it would be even more durable once properly installed.
(To echo what has already been said, proper installation matters a lot. I actually had a gunsmith start to superglue the fiber in on a new sight install... when I saw what he was doing I had to step in and show him "The Way" LOL)