Hipshot, I have a bunch of rods I got from Offshore Angler, they are 20lb. class I.G.F.A. trolling rods, the Ocean Master series, really nice rods, and have them matched with Penn 45GLS Reels, not so nice reels, that are spooled with the high visbility 40# green. I use these for inshore trolling, Mahi Mahi, small Bluefin, misc. other tunas, etc. It works great for that, you can really see the lines you are trolling, and the fish don't seem to mind it either as I have caught all sorts of fish using it.
I don't use that line on any of my big guns, because they double as shark/tuna rods, and as I'm sure you are aware, the high visbility stuff is a no-no with the tuna chunking. I would think it would be fine for shark, but I also can't see any benifit there.
MakoMatt