From the moment the rumor mill first started hinting at KTM developing an 800cc parallel Twin way back in 2014, droves of performance-minded motorcyclists, myself included, have been salivating at the thought of throwing a leg over one. Stuffed into a light, nimble chassis, this engine could power what middleweight fans have been dreaming of for years: A razor-sharp instrument for dissecting any twisty road thrown at it.  We US riders have waited through the 2016 EICMA concept unveiling of the KTM 790 Duke, the 2017 product unveiling, the teaser videos, and finally the agony of knowing that the European market would get the bike a full model year before it would cross the Atlantic. We endured the glowing reviews from overseas and bided our time until the 2019 model introduction season rolled around. That time has finally come.  The 2019 KTM 790 Duke is here. Really here – as in, one is parked in my driveway as I type this review. I wish, however, I could say that, after a couple days in the saddle of the 790 Duke, the bike is worth the wait.  Instead, after two days and many miles on some of my favorite SoCal roads, I’m left with a lingering resentment that we could’ve ...