I play a lot with the bow. When you have to play Bottesini or other solo material, you spend a lot of time on the G and D strings. I used Spirocores, but I always found them a little too scratchy on the high notes. Great pizzicato sound anyway. I tried Belcantos and they are beautiful with the bow, they respond REALLY well to vibrato and different articulations. But they don't have the boomy quality you want when you play jazz. I did use Spirocore Solos tuned a tone down for a while, but eventually I had to give up and find something that fully satisfied me when not playing classical music.
With Obligato I found it. Although I wouldn't say so for the whole set (A and E strings are somehow loose on my bass), D and G represent EXACTLY what I was looking for: a quick response on bowings, vibrato, high notes, and a fat, nice and sustained tone when walking, soloing or just doing a pizzicato bassline.
I would most definitely recommend them, if anything they are worth a try on any bass.
