Haha hey I'm that guy:
http://www.bikeforums.net/showthread...etry-Knee-Pain
I'm 5'11", so just an inch shy. At my height I haven't maxed out the seat adjustment, and there's more than an inch left so you ought to be fine there. I weigh in a little less at about 167 lbs/76kg.
I love the bike, although I do get knee pain when riding hard or for long distances. There is a likelihood that it's not related to the bike geometry and is more related to the fact that my knees are a bit weird to begin with. I wish I could tell you conclusively it's one or the other, but I'm still trying to figure out the problem.
I asked the same question in my thread to Tern, and Josh Hon, the founder of Tern replied with this:
Our seat tube geometry and your position relative to the pedals is quite standard so that should not be the issue. You might experiment by sliding the saddle a bit rearwards since the seat post doesn’t have any offset.J