I started using D'Addario Helicore Pizz in the mid 90's and with a few detours (Spiro, Helicore Hybrid, Obligato, and EP, specifically), I can honestly say that they're my favorite string, despite the negative reviews you often read about them...
...imagine that. To each his own, I guess.
My bass, my hands, and my ears seem to really love them. I play as broad a mix of music as I can, which means I might make a jazz hit on a Monday, play in the studio on Tuesday, play a theater pit gig for the next 3 nights, and another jazz hit that weekend. Comparatively speaking, they fall exactly where I need to hear them. Easy, quick-speaking, loud pizz. Deep arco, quick-starting bow response, accurate pitch, and they're CHEAP. One thing I noticed about them recently: I tried EP Weich on my bass for a while due to the rave reviews I read about them. A good string (with a nice 'front-end' a la EP regulars), but lacking in the kind of overtones of steel strings. I'm a steel string guy and I'll trade chest-punching midrange for full-spectrum overtones. Steel strings, particularly the Heli Pizz strings, had that deep-deep overtone series that I wanted to hear. Not quite banjo-like at first, but pretty bright arco for the first couple of weeks. Of course, until my hands go up for sale in the classified section, they might sound different to you. For me, they've worked for a long time.
Remember, IMHO, YMMV, yadda, yadda, yadda...
Happy Thanksgiving...