I kinda agree with some people on both sides of this discussion. It flew dead straight as advertized, but man was it a brick in the weight department. Really felt like you had to muscle it out there.
I could get it to turn over (sometimes on purpose, sometimes not) with a little torque, but it seemed to just die. Really height sensitive for the long, straight runs, as others have mentioned. I really had the best luck with it when I just tried to get a subtle hyzer line and smooth release.
Pro D was sooooooooooooooft and gouged easily, while the ESP seemed to hold up pretty well. I even thumbed it on one hole with no ill effects.
My beef was the grip; it just felt odd. I couldn't get a consistent release when I wanted distance and just didn't like the feel of the disc in my hand. Just wasn't comfortable.
The near consensus in the race yesterday was that it was a decent approach disc in the ESP, but I also heard "brick" and "cinder block" used throughout the tourney as well. I don't see it in my bag going forward, mainly due to the weight and feel issues.