Just wondering if anyone has used both and has any thoughts? Im using an old set of 370's and I like them. I wouldn't mind a little more punch for pizz on the lower strings. Arco the set works great for me. I need a lower tension string due to some pinched nerves (my hand goes numb when I work too hard). I play guts on my ply and love that feel. On my carved bass I want the 70's 80's jazz thing (I use an underwood), but with a usable bow sound. Will I gain anything spending a lot more on spiro solos? I also may toy with the idea of going into solo tuning for my own practice (Bottesini 2 would be a fun practice room challange). I play mainly jazz and go for a bright and articulate tone (on this bass). I also like soloing with the bow and still practice classical. I may get into a community orchestra again but its not at the top of my list right now. Thoughts?