My SR9 trigger is relatively heavy, but it's never been gritty. Clean break. Really clean and positive reset.
It's improved some with use. My concern is that this new trigger assembly is going to really monkey with the works. Also, I heard Ghost was coming out with a connector for the SR9, a la their Glock trigger products. That's gotta be completely up in the air, now that Ruger is changing the assembly.
-JT