Poly has received a lot of support from the horsemen and fans. Betting is up, field sizes are up. I see this surface improving with time and more research.
from the recent Michael Dickinson interview in Bloodhorse
"I believe that the tracks which install a good synthetic surface will have a lot of runners and those that stay with old dirt surface will lose horses. The owner wants his horses back. If he gets beat, it is not the end of the world; but if his horse is lame, it is not a good result and many owners leave the industry because of injuries."
http://www.bloodhorse.com/talkinhorses/MD120706.asp