The main reason for purchasing these string was style!
On an all black fretless bass these look the business. The strings are nearly as smooth as flats, so no damage to the fretboard. As far as tone is concerned, one does, as expected lose a little of the top end with these string. My only other concern is that the low E is does not have as much tension as I would like.
Although, these strings are good and perform well, I now use the Fender 9120 Nylon Tape Wound Bass Strings, which seem a bit brighter, with less "flap" on the E string.