I have good letters from my undergrad professors, but I am also doing a masters degree, so I will have letters from my academic advisor and my PI here (in grad school.) It is a disservice because it costs $250 to get the committee letter, there is an interview process, and every person I know who has done the letter was always in a hectic state over the process in general - if you have done well and impressed upon people to the point that they are willing to speak on your behalf, why should you have to then go through this subsequent composite process, where in the end, a total stranger who has only known you for a window of 30-60 minutes is writing the letter for you? I am reluctant to pay $250 if I cannot blindly trust what is being written. (I trust my professors, I don't need to see the letter to know they are writing a wonderful and thorough letter.) However, I hold much skepticism regarding a stranger writing a letter, and I am expected to blindly submit it without having seen it? If I am paying $250, I should know what I'm paying for. So, aside from that diatribe - the committee letter is based on ones exploits at that institution, and is not necessarily representative of the applicant at the time of application, or in my case, doesn't represent me now as compared to when I was a student several years ago. I would rather have my undergraduate professors speak to my talents and abilities (and each knows me in a different capacity, so it provides for some breadth of me as an applicant, the letters collectively,) than for the letters to become compounded in some curtailed essay about my aptitude for medical school.