It took me two years to get through the process, prepare for the GMAT/GRE, pick the school, write essays, get recommenders, etc. I initially picked Mission MBA as my consultants. They responded quickly and gave me an ok evaluation. We agreed that they would follow up in the new future (as I said, it was a two year process) but they never did. I immediately switched from them to MBA Exchange. I read a lot of good about them online and especially on Poets and Quants.
They were very responsive. Dan answered every single question, fully. I opted for the a la carte service on per hourly basis to strictly work on my essays. I couldn't quite afford the full per-school package. I had a sub-3.0 GPA from a competitive engineering program and a decent GMAT/GRE with a high quant score. But, these credentials were below average for an applicant to Haas. With Dan's help, I worked really hard on my essays. He helped me pull it all together and tell the best, most cohesive story possible. Also, since I have been out of school for a while, he recommended I take a Statistics class, which also helped me add to complete the application to Haas. Once I got invited to interview, I signed up for an interview practice with Marina. I was awful during our mock interview, but her insight was invaluable. Her questions and format were nearly identical to those at an interview with Haas. I was very well prepared. If nothing else, I highly recommend their interview package with the mock interview. I think that it completed my transformation into a well-rounded applicant and made all the difference. Result - I got into my first and only choice school. I start at Haas this August, 2013. I highly recommend MBA Exchange. It was worth the investment to get it done right.