Hi Rusty;
I'm working with build 4088 currently. I think that there is a newer 4091 build to that one. I've logged issues with b4088 - but, I must admit that it's a lot better than the original GA issue.
I think that the key question for you is can I use it with my PB applications in production? The criteria for that will be a mixture of what PB features you are using, the OS's you deply to, the DBMS & version you use, etc. The only way to know really is to migrate using the latest EBF's and then test, test, test .....!
HTH
Regards ... Chris