My GSLJ (~610) was strung with D'addario EXP's when I bought it.
I have since tried the Polyweb medium's, I didn't like them, I thought the coating was so thick it took away some of the tactile feedback.
Right now I've got the Nano PB's on, also mediums, I like them better than the poly's.
Deep resounding bass, bell-like highs.
Other day I was in a little mom'n'pop and picked up a set of JP medium PB's, probably will string those up in a while, my Nano's still sound good right now.
-K