I agree, Aidonius - once you get used to it, it's really cool. Also, as Mr Manring said, the timbre of the string is different.
I think this different timbre idea is really important, especially since the 020 string will, probably most often, be the highest string on the bass. Therefore, a lot of melodic lines will most likely be played on this particular string. And because it's a different timbre, the melody lines will have a slightly different feel than the harmony lines played on the other strings. For solo bass performance in particular, this can be a very good thing.