I'm looking for a new line to use with my Sage T-LL 490. I've been using an Airflo double taper line and it's worked okay. That's the line I already had on my 4 weight reel. The rod I was using it on before is a good bit softer than the T-LL. I want to try Rio Technical Trout since that has been recommended by some on the forum. The Headhunters website says that the T-LL is the Sage rod they recommend using their Headhunter fly line on. I'm not familiar with this kind of long gradual taper (I guess it resembles a triangle taper?) and am wondering why they would recommend it for the T-LL. Any thoughts from people who have used this line or might have an idea what it would be like on this rod are appreciated. I tend to keep things pretty simple. An SA Smooth Trout is probably what I would normally try, but fly lines are expensive and I'll be stuck with whatever I choose for a little while at least.