I'm very, very happy with nickel-wound R. Cooco's on a 34" 5-string - just put a replacement set on my 5, and am happy, happy, happy. A bit on the mellow side, which is great for what I do, but there is no lack of punch, and the zing is there if I dial it in via EQ. I also like the feel - the surface is surprisingly easy for a roundwound that is not ground, pressured, whatever, and the tension is just about ideal for me, although this is something on which folks can and do differ, and my own bias is to favor lower-tension sets.