I haven't tried the FT line, but I know it is the heaviest and fastest of Dan's 5 Rivers lines. The last one I got was a 6 piece 9' FTL 6 weight. It is the lightest 6 weight I've felt, and the ferrules are not noticable at all when casting or otherwise..
I compared it to an 8'6" Forecast 6 weight without guides, and my longer rod with guides and finish was significantly lighter than the other. And it casts beautifully. I like a mod/fast action, and this rod is perfect for me.