Let me just get this out of the way: I am NOT writing a glowing review about Rio Gold fly line just because I want Rio to see this and send me a hat and a sticker and more Rio Gold for my 5-weight to match the 3- and 4-weight reels I have already stocked with it. Or maybe a t-shirt.
But the first time I tried this line it was loaded on a Sage demo 4-weight rod. Granted, it was a wonderful $650 rod that helped shoot that line, but regardless, the line felt great. So great, in fact, that I ordered it for my two favorite trout rods.
This little Scott 3-weight rod is not an expensive one, but I do love it and it casts pretty well as long as it's not windy. Today I tried it for the first time with the Rio Gold and it went from pretty good to awesome! I love this line! The Rio fly lines also have a really great welded loop that I have put to the test on my 7-weight (that rod is loaded with the Rio Grand and is my smallmouth rod), and shows no signs of failing. I like it a lot better than the nail knot alternative.
(Additional cool side note: My testing ground for this was my neighbor's pond across the street from us. First cast with a little popper, in this pond that last year held nothing but sunfish, and I got a really nice size largemouth bass! After that some nice bluegill too. Could be a lot of fun this summer!)
So, bottom line is this: I think that if you're neglecting your fly line as a critical part of your fly rod equation, you might be overlooking an inexpensive way to make a $240 rod feel like a $640 rod. And for me, this Rio Gold is the best casting line I've ever tried.