Alright, here's the salt version of the review. In my opinion, if you can get away with a 6/7 wt rod to handle the wind and flies you need to throw in saltwater, the 6wt Predator is a great rod to swing. Sure an 8' rod may not cast as far as a 9', but for the fishing I like to do where you're making mostly 20-50' casts to sighted fish, its pretty perfect. If they're further out, you've gotta have perfect conditions and/or magical eyes to see them. If they're tailing, you can generally get to them.
It threw tight loops and put a quick whoopin on fish. Its appearance impressed a buddy of mine as well. When I pulled it out of the tube and said Redington, I heard "That's a REDINGTON, I thought it was a Sage." (For reference, this guy's flats boat is worth more than both of my household's cars, combined)
The 6wt Sharkskin Magnum line is a great match for the 6wt Predator. Its definitely heavy for a 6, so it loads the rod quickly and well. From a durability standpoint, I can't yet say whether Sharkskin is worth the additional 30%, but I'd say it does performance wise. Wow that stuff shoots like crazy.