Yup, a lot of high end performance cars (Corvettes included) and most better German cars come factory filled with synthetic. This is also the case with a lot of bikes, especially Euro bikes.
I swapped to Kawi fully synthetic at the first oil change (600 miles), it runs awesome with no oil consumption and very smooth clutch/shifting. I ended up going with the Kawi full synth oil because it's very reasonably priced and what the hey, zero warranty concerns or "right properties" for the clutch and trans, kinda no brainer for me.
I use a lot of different oil brands depending on what's recommended, what weights are available, etc. The main difference I see in oil for bikes with shared clutch/trans is how well the clutch works and how nicely it shifts. I think as long as the engine has a nice supply of reasonably clean quality oil there's little difference until you get to the extreme operating temperatures. Personally I use 100% full synthetic in all my vehicles as I've see the difference in oil break down for dino oils. If you change oil super frequently dino oil is OK.