It's like a ten minute test and gives you one of 16 personalities, honestly it's been quite accurate for me and a lot of others.
Try it out and post your answer - you can read a ton about it if you want, there's actually quite a lot of info around about each type (don't go for the full profile on that site though, they're asking for money)
EDIT: Made it a second time, result was amusing. Same letters but pretty high difference %-wise.
Just it lacks judging intuition and observation correctly as I combine both and not just rely on intuition mostly like the test thinks.