I got a 1200 or so on mine taken two or three years ago(799 speach/writing, rest was math). But then again, I test horribly, and suck at non-applied math. From what I've seen, however, it really isn't much of an indication of anything, except how much less you're going to have to pay when you attend college.
It's frustrating that our educational system places so much time and importance on these things when they could spend that money on books that don't still show that man has yet to reach the moon, or on refurbishing school restrooms so they aren't health risks. Honestly, all of the brightest people I've ever met have gotten 1100's and below, and go on to be wondrous successes, in contrast to a good number of 1500 achievers I know who can't keep a steady job. I guess the lesson to learn from these failures is that you shouldn't let it go to your head. It's just a number which gets you a bit of cash if it's high enough, nothing more.
Unless you get a perfect score, which means you're damned smart.