I don't like it; I think it sounds too popular and Britney-Spears-y. I'm not sure what spelling I like. I don't like Brittany, because it looks like it's 3 syllables when it isn't. I probably like Britney or Brittney better. Brittania would be cool though.... :P
I've always liked it but only spelled Brittany. If I had to pick another spelling it would be Brittani but I really don't like Britney or Brittney at all.