I strongly recommend ApplicantLab to anybody considering an MBA! I come from a fairly vanilla work background and was worried about differentiating myself among applicants in my "bucket". I utilized ApplicantLab for every aspect of my application (resume, essays, interviews, recommendations, etc) as the tool has advice for anything you could think of, as well as things you may not think of! Before using the tool, I had no idea that MBA admissions committees look for resumes that highlight experiences that generally aren't the focus of traditional professional resumes.
Within the tool, you are encouraged to map out experiences in your personal/undergraduate/professional life that demonstrated key traits that MBA programs look for in strong applicants (leadership, mentoring, innovation, overcoming obstacles, etc), and then allocate those experiences/stories to your essays, application boxes, as well as your interview question responses (especially useful for elaborating more on stories that you could not include within your essays). Most of this advice is included in extensive videos that Maria has recorded for each specific section of the application process.
In terms of essay advice, Maria includes specific advice (both written and videos, which often include much appreciated humor) for each required and optional essay for a school. I can't stress enough how detailed the advice is for these essays. Maria includes hyperlinks to specific offerings that each program is particularly proud of (and thus, very good to reference in your essays). There is advice for basically any top-50 program and Maria will add schools if there is interest.
I also purchased a mock interview with Maria. Maria’s advice was incredibly detailed and the interview itself simulated my actual interview to a tee. She spent about 1.75 hours speaking with me; she recorded the interview, and then discussed her feedback on the responses I gave to each question. I found the small tweaks she suggested to my answers particularly beneficial (putting less emphasis no my technical experience vs interpersonal experiences). I definitely felt like my interviewers were impressed with my responses.
Ultimately I was accepted to CBS + another top-15 program, and received interview invitations to the other 4 schools I applied to (withdrew my applications as CBS was my top-choice). Not only that, I received a generous fellowship from CBS, which most people told me was a significant reach for me!
I strongly believe it would be beneficial for every MBA applicant to utilize ApplicantLab; Maria has put a great service together, and the price is almost certainly cheaper than any other admissions consultant service.