I got it done about 3 years ago. It worked REALLY REALLY well and worth every cent.
HOWEVER, I was in absolute AGONY for about 4 days after. I am the only one I know of who experienced such pain but be aware that it does happen. I have very sensitive teeth. I could not open my mouth for days afterward (because of the cold air!).
I actually had to stop treatment about 15 mins early because of the pain.
As I said, most people I know who had it done didn't experience this, but I did. Once the pain was gone, it was totally worth it. I'm getting it done (and expecting the pain) again this summer.