I bought a full range of the Airflo Coldwater Striper Lines designed for US Striped Bass fishing. I like them a lot. They seem to handle well in the coldest of conditions.
They handle things like Clousers well, and have a very smooth, hard(ish) finish to them.
Taper wise, they are not super aggressive, but do cast very well.
I also have the full range of 40 foot plus Coldwater "Sniper" lines. I got them for Pike in a 9 weight. Aggressive, not very subtle and have a ridged finish. The running line is pretty thin but not so prone to tangles s the Rio Outbound.
My biggest gripe though is than when it is really cold, the ridges hold water and "pulls" water onto the guides. You end up spending a lot of tie de-icing the guides or reel.
I used them on the West Coast for Pollack, and again the ridges seem to pick up sand and dried salt.
However, they do deliver any fly you could want.