INTJ here. I've taken this test several times, with years between each one and I have always consistently been an INTJ. I've read up on a lot of perspectives of this personality type, and they are all eerily accurate. I know sometimes the world of psychology is looked at as very subjective and hardly a "science" of any kind, but it is hard to deny that there is at least some validity to it when you're reading papers written by many different people who've never met you, but seem to know your every motivation, drive, strength and weakness (well, at least those of the most basic nature; clearly we all differ in more personal areas of faith, politics, relationships, etc.).
Anyway, these are always great for discussion, especially in groups.