Sonic is a cheaper trout “LL” fucking farbanks can’t even figure out a new rod so they dig through classics. A 389 is a 3 piece. Not a 4. Sorry, nothing against you but they suck for attempting to bring back the LLI/my partner had one for a bit. it's definitely a stiff rod that takes quite a bit to load up. I thought a heavier line like the Perception worked well with it as a nymphing line. I don't remember if I tried it with a rio grande but I have to imagine that would do the trick as well. It would be an ideal beach rod, lake rod, or drift boat nymphing rod, but I wouldn't grab it if I was dry fly fishing. Ultimately, my partner wanted a rod with a bit more feel. After trying out different rods this summer it was hard for her to go back to the uber-stiff Sonic, so we sold it and got her a Trout LL which suits her better. That said when I worked at a fly shop I had customers rave about the Sonic all the time. I guess it kinda depends what you want to use it for.