Check the first page, I have one. I like the pro one better but my game is heavy topspin.......I believe if you are a flat hitter the 18x20 will serve you better. Also, depending on the strings the racquet will play completely different.
My pro one with SOLINCO tour bite plays my different than my other pro one with pro supex blue gear at the sae tensions.
To each there own....... The donnay is a great stick none the less.
Ps- With the x dual pro use a poly with more pop like tour bite. A less powerful poly make the frame way underpowered even for us heavy hitters