| I have a set on my P+J frankenbass right now -- it has a maple fingerboard Jazz neck and EMG's. Just put them on a few weeks ago. These are the "funkmaster gauge" Rotosound Swing Bass 66: 30-50-70-90. Obviously it is a little bit early to see if they are affecting the frets.
The good:
Man, they are easy to play. And suprisingly they don't sound as thin as I had expected through my Ampeg V-4 with 2x15 cab. They do sound sort of thin through my Workingman's 10 -- but combined with the "modern" tone of the SWR, it actually really nails that poppy, synth-laden 80's-90's pop/funk/R&B sound. They stay in tune fairly well considering how easy it is to really wail on them. They've made it through a few beer-fueled "it's 1990 and I am Flea" type jams, and they didn't break or show any ill effects.
The not-so-good:
You can't really get the action super low though because they "rubber band" quite a bit. But they are so light that the slightly higher action doesn't really matter very much.
You're going to have to do a pretty major setup on your bass. My bass had formerly been set up with a pretty standard 45-65-85-105 set. When I put the funkmasters on, it really threw the bass out of whack. I had to spend a few days adjusting the truss rod and getting the relief right again. As I said above -- these strings really "rubber band" a lot so that made adjusting the truss rod more challenging than usual. The other big issue at least on my bass is the nut. The G string is so thin on the funkmasters that it sits too far down in the saddle and causes some buzz. I had to put a little piece of cardboard in the nut slot to raise the string enough so that it wouldn't buzz. This one is probably more an issue with my nut than the strings but it didn't buzz with a .045 G string.
I like the idea of keeping a bass set up with really light strings for slap -- but these might just be a little bit too light. I'll probably end up trying something slightly heavier and see how that compares before I re-do the nut. | 
Rotosound FunkMasters 
