Josephus,
A resounding YES. \"Speed holding up\" is not the way you should measure the skew of synthetic tracks. The right way would be to measure how quality dirt horses, with established figure levels, run on those tracks. A classic example would be Unbridled Belle. She ran like a mule at Keenland after competing against and often beating, the best dirt distaffers in the country. Anybody think Carriage Trail could beat Unbridled Belle on dirt at Belmont, Saratoga or any other dirt track? Not. Did you watch how bad Mini Bhavan ran at Keenland. An extremely quick and dynamic horse at Saratoga. Was completely impotent at Keenland.
You can bet speed on the Pro-Ride surface (and Keenland), but only speed with synthetic established form.