Running FL 11 Producer (Signature BUndle from FL 10), everything is going smoothly apart from one or two little things (i.e, WordBuilder issue and the UI looks stranger) but it's mostly improvements.
On a plus side, FL11 doesn't make my M-Audio Delta settings lock up so I can now properly adjust my buffer size. Made my response time slower by 6ms on purpose and the CPU load on all my project have gone down by a noticeable amount (Currently running at 12ms latency). I've noticed it's alot smoother now when you add plug-ins to your channels in the middle of playback, it doesn't freeze the track on the larger fx plugins loading up like in FL10.
EWQL Symphonic Choirs WordBuilder, the mfxshell plugin I used to run it through on FL10 can't detect the MFX-PLAY variant of it anymore. Oh well, I'll just use it in FL10 for now, hooray for side-by-side installation.
Can't wait for the full version of FL64 to come out, if it works aswell/better than the Beta then I will be eternally happy and build a shrine dedicated to it's greatness!