While Joni uses mono for nymphing, I use the furled (Uni thread 6/0) for everything except stillwater. She furls nymphing leaders out of uni and kevlar that sinks pretty good. Uni furled with mucillin or any floatant with 3'-6' of whatever tippet you need. Kathy Scott's DVD shows you how easy it is to build a board and furl a leader. (And making the Shorb loop)
So you buy some Uni 6/0 (250 yards), couple bucks there. Olives, blues, white, black, whatever color you want. Build your board for under $20 (that's a fancy board).
A couple bucks for a "knit picker at JoAnns.
A furled leader will last, and last and last. If you get a windknot in one (very hard to do) it won't affect the leader at all. It will last all season.
In essense, you can build 5-7 leaders with one 250 yard spool.
Put in some florescent colors on the butt and you have a strike indicator.
The kevlar is used for nymphing or sinking leaders.
It's furled so it won't spray water when you lift it off the water.
THIS IS NOT LIKE A BRAIDED LEADER. TWO DIFFERENT ANIMALS
You can attach a strike indicator on a furled leader. As split shot (goes on the tippet)
There is no memory- you can cast a furled leader with your hand and have it perfectly lay out. It's usually 5' or so long. Perfectly dragless casts.
Don't spend $13 for a B*ue Sky mono leader either, not when you can build them for pennies.
And it's actually it's quite relaxing to build one.
Furled Leaders - Login
. For more info.