As mentioned, CA allows it (for speeds under 10mph) and I'm glad they do. I take advantage of it when I ride, and make room for bikes when I don't.
What I don't like is the "Harley" riders with open pipes that feel they need to constantly blat their throttle as they make their way through the traffic... that's totally unnecessary.
What I also don't like is if the traffic is heavy but moving at PSL or better and the bikers decide that's a good time to lane split... at that speed, it's dangerous.
But both of those cases are not a lane splitting problem, but rather a stupidity problem.
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