All of my four-string basses were strung with Rotos, so this set seemed to be the logical choice.
I'm primarily a slap and fingerstyle bassist. I play a lot of alternative rock and metal, so I prefer a more agressive bass sound.
Rotosounds have a great tone, which cuts very good through the mix. They seem to have a nice longevity, because the tone stays bright for weeks. And I have broken only two strings, each after months of hard playing. However, the bright sound produced by these stainless steel strings might not be for everyone. Also Rotos feel a little more rough on the fingers than some other brands, so this may be considered a downside.
I would recommend Rotosounds to everyone who's looking for affordable and reliable stings. Even if they turn out not be your favorite set, it's worth to try them out.