I like it a lot, although I slightly prefer Sibyl. The biggest negative (for me, anyway) is that I do associate it with Sybil Dorsett, the woman with MPD. "Sybil," the movie based on her life, scared me half to death when I was younger.
Because of her story, I've heard Sybil used as slang for a woman who is so difficult and unpredictable she acts as though she has multiple personalities. It takes some of the shine off the name for me.