Well, I'm definately in the minority here, but I will only run mono off my inlines... 20lb test.
No leader required, just a snap, not a snap swivel.
Mono is elastic as has been described above and personally, that's what I like about it. Hook sets are not a problem, the bait moving through the water will set the hook. But, should I hook into a rather large wet sock, mono affords me the elasticity to not rip the hooks out, as no stretch is want to do.
The boards like mono and in rough water, mono acts just like an elastic and will change the lures speed all the while I am sitting back waiting for the rod to go off.
I fill my spools, I use Diawa Sealines and it is not un-heard off to have 450ft+ of total line out. Actually, this is my preferred method, especially when the bay gets busy and the fish are spooked.
I also really like running lead core. I have five colours on that rod and another 200ft (roughly) of backing on that spool. I will run all five colours in the water and use the backing to connect to the board. The lead core really helps me dial in a depth and repeat it.
HH