It sounds prettier than the overused, annoying Chris and the immature-sounding Chrissie, but I can't say I like this name either. It's still quite cutesy and too common.
It's my name and it's always mutilated. It's CHRISTIE, not Christy, Kristi, Cristy, Kristee, or Chrissy! The original spelling is the least trashy and chav-like, I think.