After giving the Obligatos on the Shen two months, I have given up on them. If I was pizz minded, these days, they would have stayed for sure, but despite the general concensus here, my teacher and I never really fell for the arco tone, and that is where I am really trying to spend my time and energy right now. My bass is still very new, and they just don't seem to have enough energy to get the top cranking. They are thin sounding and a little whiny on my bass. I am now on the third day of the new Flexocors (medium). The bowed sound is obviously many, many times better. Pizz, they are tubby, but they are fine for me. Arco, they are noticably more musical sounding than the Obligatos. Especially, the D and G, which was a fuller, warmer sound. The E and A are still trying to get played in, but overall, they made a wonderful difference in the Orchestra sound on my bass.