What others said about the site being organised by Davidson's and therefore PG-enriched! Some of us have no test data, though, and are just here because it's helpful. (My DS has achievement in his areas of strength that look PG; I'd be quite surprised if he had an FSIQ at that level, but really, who cares? I need to do the best I can for what I see, and for that it's really helpful to read posts from other people who've faced similar challenges.)
What I do know is that reading other GT forums has tended to leave me in one or more of these states: tutting over other parents making a fuss over achievements that seem nothing out of the ordinary to me; regretting the lack of activity; resenting the aggressiveness of some posters to the whole idea of giftedness; feeling embarrassed that my DS is still way outside the range of what's normal on the board. I feel pretty comfortable here - some posts irritate me sometimes, but I also feel it's worthwhile reading here almost every day.