Motor is an evolution of the 1125cc Rotax that was spec'd by EBR and built for the 2008 Buell 1125. EBR has a deal with Rotax. I owned one for 10K+ miles and it was flawless. There were some reported stator issues but I never experienced it. Rotax also OEM'ed motors for the Aprilia Mille V-twin and I put 26K miles on street and track on my 2001 Mille R, which proved to be the most reliable bike I have ever owned.
Braking should be completely sorted as the ZTL-system (Zero Torsional Load) has been fully developed on the track and the ram-air cooling ducts were proved to keep temps down in AMA racing conditions.