The biggest problem with the Pro is getting one... (un)patiently waiting. Clearcoat issues have been fixed.
Yes, pro's are currently on the line and are either leaving Stern as I type, or will very shortly.
Quoted from MikeS:
I think the biggest issues with Pros so far have been the Raptor gates breaking and the upper flipper post coming loose as well as clearcoat issues on early run machines.