I've played the Pro Open for the past 4 years or so (K Pro-Open then BLX Pro-Open)
But the past couple of times out I hit with my friend's 2010 APD GT and I do like it better. It's not a whole lot different. A little more spin. A little more stable. And a little more directional control (the ball goes where i want it to more often).
I'm going to demo the 2013 tonight and then I'll probably pull the trigger on one or the other depending on how the 2013 hits.