I've tried it thrice. It's intense, amazing, relaxing, eye opening, even a bit frightening... it is truly sublime, and makes most other psychedelics seem like child's play.
There really isn't much specific detail I can give you about it... trying reading up on it via Erowid and checking out the experience vaults if you're looking for some more personal accounts... though these tend to be somewhat sensationalized.
When it comes to psychedelics, the best way to see what it's like is to try it yourself.
I wouldn't recommend DMT being your first psychedelic experience. I also would not recommend trying it until you're roughly 17-20 years old. Let your brain develop before you start experimenting with psychedelics. I took acid for the first time when I was fifteen, and have taken it several times since them... as a result, I have become a very bizarre 22 year old.
I'm still awesome nevertheless, though.