I'm an august MCATer. I took it THE SAME YEAR of my applications, not a year before, so I am a GENUINE August MCATer. Did it hinder my chances? There is no way to really find out because I would have to reapply with all my stuff complete at the same time as everyone else. That being said, I can say with certainty that I would have scored lower had I not taken the summer to study for the MCAT. I think my higher scores paid off in the end. My timeline was only a little bit off vs April MCATers. I was complete everywhere by Oct 16 which was the day we got scores back, and I got my first two interview invites a week later. My first interview was at U Pitt in November followed by UMDNJ a week later. I then interviewed at NYU in early december and got my first acceptance in early december also (from UMDNJ-NJMS). In January, in the first round of acceptances, I the got letter from NYU. In Feb I interviewed at Northwestern and in March I interviewed at MSSM. The MSSM interview was a tad late, and this put me at a severe disadvantage-the dean came out and said straight-out we we're all either going to be waitlisted or rejected (but in a nicer way). In between all of these interviews I had to turn down several invites from many good schools including Einstein, Temple, Drexel, Tulane, and NYMC. In retrospect, I would not have done anything differently. So, if you really believe that taking the August MCAT will give you a higher score (mid 30s at least) then by all means delay it.