This review is written by someone who has used Rotosound Swing Bass strings since the seventies. They've been on every Jazz, Precision, Rickenbacker, Thunderbird, and Warwick bass I've ever owned. There was a short stint in the eighties, when I was a bit disappointed with the (sometimes) muddy sound of the low E string, so I used Ernie Ball for a while. Overall quality of Rotosound strings was a bit down during this period. But for the past 20 years it has been Rotosound and only Rotosound for me. True, the low E is still a bit dull sounding, but I'm starting to believe that's due to a physical law that can't be manufactured away.
I change my strings every 6–12 months to retain that wonderful brightness and overall tuning stability. I don't sweat very much, so the sound quality (brightness) actually lasts up to a year. Not bad!
Rotosound Swing Bass strings make every bass sound as good as it can, in my opinion. I usually turn both the treble control of my amp and the tone knob on my instrument down a bit, because these strings are often a bit too bright. But whenever I need that sparkle, it's at my disposal.
Yes, I'm a believer.