I have them on my 78 PBass & it sounds GREAT. The sound is pretty even & has been since I put them on. They have a decent stiffness to them, and do not sound really awful & bright, like new strings usually do. I hardly ever play my PBass anymore, in favor of my Pedulla, but these are great strings, and have been on for about a year and a half now. They will fray a little bit, especially if you are using a pick for an extended duration.
I am considering using them to help tame my G&L L2500 as well, although considering the price as well as the fact that the G&L sits in a closet means that it has not yet happened.