Seriously, the smoothness of a good roller sear to a std sear the is almost no comparing. I know many ppl that could't or didn't like the grinding action of the plate rubbing on the sear (you might think you can't tell, but wait until you try a roller) but with teh sear rolling on a nice smooth ball bearing, it's just so great. Buttery smooth.
As for faster? Well, I personaly just can't shoot a slide trigger very fast ... so i couldn't really be able to comment. I imagin it would because you're fighting less friction ...
They Feel GREAT tho.
-Micah