Roller cam/lifter retro drop in, thoughts?

I did a Comp. street solid roller w/Comp's lifters in my 470" after losing a solid flat tappet. Has about 4k mi. on it now with no issues. The lift/duration/centerline numbers between the 2 were very similar but the roller idles smoother and runs MUCH better. Just my experience..your mileage may vary. lol