I ride a medium Rapid, and I'm 5'-11". The seat post is a little higher than average, but the bike fits me very well. I'm not an expert, but I'm riding 150+ miles a week (55 miles non-stop is my longest single ride so far), and I don't have any comfort issues. The only thing that I have changed fit wise was the seat post (installed a zero offset).

Of course, it's really going to come down to you. You'll just have to get on the bike and see how it fits you.