The Warwick Black Labels are just the strings for some grooving metal sounds. Combined with a Bass with active Humbuckers these strings provide a very strong sound with strong mid-range, alot of bass and some high-range.
The sound could be best described with a harley davidson's roar , but can also produce some decent mellow sounds, depending on your finger-style playing. The slap sounds aren't very convincing, the strings lack a decent portion of high-range for that.
For it's price of around 30 bucks these strings are a good alternatie solution to higher priced DR strings, but offer about the same sound.