I saw this by complete chance the other day. It has been a few years that I switched to the .045 nexus string sets from Rotosound rs66ld (stainless roundwounds) to all my bass with 2 exceptions where I use flat.
Compared to the rs66, they sound a bit darker but it is very similar to how the rs66 sounds after a bit of breaking-in.
In my case they have lasted a decent amount of time, considerably longer than the rs66. Also due to the fact that I have multiple basses that are not always in rotation, they do not "age out", meaning that they do not deteriorate over time on an unplayed bass (I find that all normal bass strings do that).
Last but not least, unlike another company with black coated strings, these have a hex core which gives a more taut feel in my experience. Two of the instruments I use utilize alternate lower tunings and these strings handle that very well.
Unfortunately, they do not offer them in that many gauges which could be a problem for some.