This is one of my favorite lines that I own and it has caught many of my best fish, that being bass, trout, ect...
I primarily fish this line when fishing for trout or using indicators as it can turn them over well.
I enjoy the delicate approach that is offered by this line without an indicator when presenting nymphs and wet flies. Swinging a fly is simple and the long belly allows for Spey casting a viable option aswell.
This line preforms very well with softer actions rods because it can begin a cast with less line as the thin taper at the tips can load a soft rod better than a stiff one. If you are fishing larger water where to need to mend long distances this line works great , the belly of the line being in the center allows you to pick up and mend easily.
I would say that any serious trout angler should consider this line and aswell as anyone looking to start with a little single hand spey.