Phil,
I use fireline crystal in 2lb for breaming and yeh I love it. Not sure if I would use it with some of the high end Bass Hard body lures.
It casts VERY smooth I reckon its perfect for flicking SPs around, you get a lot more casting distance and its extra finesse But I would still use a leader with it.
Im waiting on some new line ( Varivas Sea bass) the lowest strength it comes in is in 10lb but its very thin for its rating. Will let you know how it goes.