If your a really bad writer, and don't have anyone else that is willing to completely re-vamp your personal statement, I don't see anything wrong with paying someone 150 (cost of MCAT fee) to make sure your personal statement is on par with the rest of your application. I would definitely go to their site and at least use their tips and read their sample essays though. And get a lot of people to read your personal statement for you (professors, friends, etc); make sure that they are honest with you when giving you feedback too. While your personal statement won't make up for the rest of your application, it will help your app stand out if it's good and it's a small price to pay if that's the only thing holding you back from getting into the best school possible. Just my opinion. In order of importance, IMO, at most schools, MCAT> GPA> interview> ECs> Personal statement/application.