I only own one bass, which I bought about ten years ago. I restrung it (Squier Affinity P) back then with a set of Dunlop nickel-plated steel roundwounds, .045-.105. I only got it out occasionally back then since I didn't really play bass yet. But in the last few years bass playing has eclipsed guitar playing for me, and now I'm doing weekly band practices with it, still on the same 9- or 10-year-old strings, and I like how they sound and feel.
I don't much like how new rounds I've tried sound. When I started out I thought I wanted that new-string piano twang, but I've evolved into a guy who plays fingerstyle, pretty softly, with a pretty loud and slightly dirty amp, and deader strings sound better to me in that scenario.
I'm thinking of trying chrome or cobalt flats whenever these strings give up, hoping to bypass that new zing and enjoy a long period of tonal usefulness.