RE:Rio's new high density head - saltwater sinking lines
According to the rep, it is specifically designed for striper fishing (per the striper intermediate line). I will ask him about it's application to colder temps.
I've fished it in moderately cold SW as well as summer warm temps. On the other hand I have fished the intermediate striper line in the cold waters of the pacific northwest, which averages 52 degrees in the spring and fall. It handled well, although I felt the coils acted better on the striper shoals on Cape Cod in August.
Frankly, I never had a problem with T-300 or the 444 QD 325, it's just that the junction between the sink head and the running line seems to always fall apart. IN my opinion, the first one to make a line where that section remains intact for a 2 or more seasons gets my vote. I am hoping Rio is the one.
I'll have better info when I contact the rep.