I think the competitiveness of the Duke vs. these bikes is relative to the rider and track. I didn't race last year, just did trackdays at Hastings, NE and my local. My lap times with what I considered my "streetbike" at the time made me realize the Duke would be fun, and somewhat competitive (and I missed racing). Mine has a PCV and an akra exhaust, but stock suspension. I'll be running with Alpha 13s to start the season, and then switch to slicks when I wear those out. I also scored a set of rains and a spare set of wheels for a good price. Aside from a fella on a cheater SV, and another SV guy I battled with when I had my ex650 superbike, I'll be in for a sniff at the podium (unless the Buell 1200 guy shows up!). If it rains, I think I'll be in good shape. Knowing what I know about watching at Brainerd and hearing from others who have raced there, the full course might be tough on the 690 with that LOOOOOOOONG front straight. The Donnybrook configuration would be more suited to the Duke.