CK, I've used RR's off and on but cannot tell you I caught all that many crappie off of 'em. I did catch some fish but IMO jigs out preformed the RR's most all of my trips. In all fairness though, I really havent gave the RR's alot of fishing time and when I have used them it was only like 1 or 2 out of the 12-14 lines I pull.

As far as line, dont think I've heard of anyone trying braid. You'd have to have some very good eyes to see that small diameter line to straighten out all the tangles youre gonna get while longlining.
Whichever line you decide to use you'll have to see what depth your jigs run because line size will make a difference.