i think i read that the nurbs are 22-23lbs for the 19x9/10.5 which is in-par with most mid-grade high performance tuner wheels.
if you can get near 19lbs you are in high-grade performance wheels. if you can get to 6lbs like the Weds CF wheels, then that is crazy super high-grade and expect to pay $10K+ for a set.
anything over 25 becomes pretty noticable in handling and especially braking.