On my trip from OKC to Indy and back I found that the up right position for me is just a little too much up right. I find my self back on the seat more than when on a short trip to support the buttocks better and when I do tha the angle causes me to have to use my back muscle to hold the position and then my back starts to ache. If the bars were lower about an inch or so I think it would be perfect. I would have also preferred a seat that was wider towards the tank and therefore more supportive on the buttocks.
Overall the Ninja with side cases was an excellent touring machine for me. We spend a day riding through Arkansas and did the pigs tail and the bike just shined. The Ninja's motor is perfect, I never came out of 6th or 5th while the others with me were shifting to stay in a the proper rpm range for their bikes. I was so much more relaxed and enjoying the sweeping curves becaue of the beautiful power band this motor has. NOTE: I went up two teeth on the drive sprocket to lower the rpm at highway crusing speeds. Though the front end does not come up quite as easy as it did before there is plenty of power across the range in any gear.
I have owned the following sport touring bikes 2004 VFR 800, 2007 Sprint ST, 2007 VFR 800, 2008 C14, 2010 C14 and have ridden the ZX-14 and the BMW K1200S and the Ninja is by far my favortie for commuting, distance and a little hooligan fun.