I tried warwick strings on my old corvette (now sold) a couple of times, as they were among the cheapest you could find. Don't think I ever tried the black label though, only the red. I think they sounded ok for a short while, but they died IMO rather quickly. The worst thing was however their feel: It felt like the strings were covered with sand paper...
Then I stuck to elixirs for five years, and now I actually have flats on both of my basses.
