You have to play with an extremely light touch with the Jazz rounds, and if you like the lighter gauge of that set, they are very good sounding strings. Especially after they break in.
Go see this guys videos on you tube............ http://www.youtube.com/user/GBagley
browse through all 50 or so vids, because he uses them on several basses.
He's M5Yates here on TB, and knows how to play a set of TI JR's, You'll see.