I use the T-200 with my 6 and 8 wts. I had never used a sinking line before, but I watched the video that came with it and after some practice was able to throw it. They recommend a roll cast + a full cast and it really goes like a bullet. I have used it mainly for Bass fishing - pulling something along the bottom or pulling something that floats above the line, like a carolina rig. It does wear you out and trolling it behind a tube helps that part. I want to try it throwing big streamers for trout ala Kelly Galloup this year. It does what they say and appears to be a well-made product. From what I can tell, all the guys at my local shop use it as their sinking line.
To Miss Nancy - she hated fishing, but loved a fisherman.