I'm just back from my first ride on the bike. I chose a mixed terrain of steep hills and descents, long flats and some undulating terrain, about 60 miles in total - I didn't want to go too far initially in case I found I couldn't get comfortable - but in preparation for iron man triathlons this was a good tester.
It's a very stiff stable frame that seems to get more stable the faster you go. It is remarkably stable above 45mph plus with none of the speed wobbles I would have expected on my previous frame. Power transmission is awesome with minimal flex when out of the saddle powering up the hills in a big gear.
Dom Irvine