i used to play with it, moved to the 18x20 version. i liked it at first, but you get bullied by power hitters, because it's not that stable (light perhaps).
I found it to be a bit light. Even with a bit of lead at 3 and 9, it only weighs 320grams, that's with Wilson Sensation and no dampener.
Lacks power and the ball doesn't go through the court. Very nice feel though, and it is a quality product.
It's a good racquet once you put some lead on at 3 and 9, as the other posters stated. Seems like the sweet spot was a bit smaller than the Aerogel 300 I'm using now, but maybe that's because I was using a higher string tension at the time.