BB Creams: Yay or Nay?

BB Creams have only recently made an appearance on the US beauty market.  BB creams, also known as Blemish Balm, originated in Asia.  BB creams are a one step product as they brighten, moisturizer, prime, and offer light coverage for your face.  Maybelline, Covergirl, Gariner, and L'oreal have all come out with their own version of BB creams but I've heard none of them are actually BB creams.  I don't know which brand to try.  Have you tried BB cream?  Any recommendations?