I do, for normally developing kids.
Be aware that GT families tend to associate with other GT families. My kids and I were in a playgroup that led me to believe that my son was MG, most of the kids were ND, and one or two were a little delayed. It turned out that the majority of the kids were MG or HG, the ones I thought were behind are ND, and my son is HG+. Live and learn...
Your perspective may be skewed by who you spend time with. Mine sure was!
Last edited by Kriston; 11/19/08 08:17 PM. Reason: Not that I'd swear by the books or anything, but I do think they're pretty much accurate now that I know a bit more about what ND looks like.