I agree with Airbass's overall prognostications. In my case, however, the Obligatos did sound very good on my bass. Coming from Helicore Hybrid strings, the Obligatos were like a dollar over a dime. There was no comparison in any regard.
The E string will have some nice modern jazz growl to it when set to the right string height. If you set them too low, however, you will loose some volume because they need a little room to move around.
Farin is correct that Spiros will have more growl than about anything out there. The Obligatos will have a much warmer and organic sound however, especially on the D and G, and they bow better.
You might consider playing them a couple or three weeks to get used to them while they settle in before dinking around with your set-up too much. It usually takes a little getting used to how any new strings react under your touch.
Also, Pirastro could not have sold a ton of these strings if they weren't pretty good. I think that you'll end up liking them quite a bit.
Good Luck . . .