I just picked up one of these guys a few weeks ago, and have been loving it, but haven't found a string that seems to be a perfect match. So far I've tried: Sadowsky flats: great string, a bit more flexible than the fender, but I'm not totally sold on flats for this bass yet (well, its more that I like to be able to get a roundwound tone out of the bass as well as the flat thump, rolling off the VTC gets me 90% of the way to flatsville) Fender medium flats- fundamental sound great, but they feel like powerlines. too stiff for me, and oddly, the gauges make it so that the G and D are MUCH heavier and tighter feeling than the A and E. DR fatbeams: a good overall string, nice feel and tension, but their inherent dips and peaks seem to be less than an ideal matchup for the sadowsky own dips and peaks. Just IMO, but not the ideal round for this bass, but not terrible by any means. Thomastik jazz rounds- the bass came with these, and I really liked em. Nice and flexible feeling with a pliant bouncy midrange and smooth tone overall.. compliments the warm mids of an alder rosewood bass nicely Thats what I've tried on the bass so far, I'm kinda tempted to try out my old standby, D'addario XL's (just because I know them so well, and they always give me a solid reference point), but I would love to hear if anyone feels they have found the holy grail string for their RV4? thanks!