Actually, yeah I have used their services. They were really helpful and gave me useful advice and constructive criticism on my application. Their counselors are from top med schools so they know what they're talking about. They are also less expensive than other companies, which for me was a huge plus. I am planning on using them again (hopefully) for interview prep.
I just found out about them during the application process, but they also offer services to help craft your med school candidacy while you're still an undergrad. My little sister, who is going to be a sophomore, is going to use them for that.
Hope that helps.