You will find many, many ringing endorsements for MTCA (and other coaches) on this site. Use the search function at the top of the page and you will find them, here is one:
http://talk.collegeconfidential.com/discussion/comment/16458561#Comment_16458561
Here is a useful thread on coaching in general:
CoachC, who I believe is the founder of MTCA, is a poster of some regularity on this forum. You easily read her awesome posts by clicking on her name and then clicking on “Replies” in the upper left corner of her profile page. Here is a typical post:
http://talk.collegeconfidential.com/discussion/comment/16502063#Comment_16502063
The depth of her knowledge and her patience with us crazy parents shines through her posts (we did not use her, so I think I am pretty objective about this).