One thing that has astounded me about Circle K strings is how much of their 'newness' they seem to retain after being completely worn in. I went back to using some D'addarios and some steel Warkwick strings for a while, then a few weeks ago I threw on my old set of CKs that had been sitting around for a year after a solid year's worth of use on my 6 string, and I was blown away by how much better they sounded despite their age and use. They are by far and away the brightest 'dead' strings I've ever owned. I just ordered a set for another bass because I don't even see the point in trying other brands now.