I purchased private tutoring from Manhattan GMAT and was paired with Brett Beach-Kimball. Before engaging in online tutoring I had attempted to study on my own and was stuck hovering around the 640 mark. After 8 hours of tutoring from Brett, I took the GMAT and scored a 730. I found the online classroom easy to use and navigate. I must admit, I was skeptical at first as I am very much not a computer guy, but the forum worked well. Brett's strongest attribute as a teacher is his ability to explain problems in multiple ways. Whenever I would have difficulty with a particular problem or concept, Brett would ask me to talk him through my thought process on tackling the problem. Brett made his recommendation on how to approach similar problems in the future based on my thinking and learning style, and did not try to force a "single solution" model on me, which was quite beneficial.
Brett and I also worked together to create a solid game plan for the month leading up to the GMAT. His recommendations were spot on and enabled me to perform at my peak on test day.
The out of session work assigned by Brett on a weekly basis proved invaluable at preparing me for test day. When we started together I was having to rush through the last 7 or 8 questions on the quantitative section. On test day I was able to finish to quantitative section with ten minutes to spare.
It is important to note that in order to maximize time and money (as the tutoring is pricey, but well worth it) you must spend ample time in between tutoring sessions to practice sets and drills. Brett and I met every Monday night for two hours. Between sessions, I usually studied for at least an hour on weeknights and 3 hours on week ends.
Brett is a true professional. I would recommend him to anyone seriously looking to improve their GMAT score and is willing to put in the extra time to do so.

My practice test scores were nowhere near where I wanted nor reflective of my ability.

Abby and Manhattan GMAT made all the difference and I got the 700 score I wanted.

Working with Abby was an excellent experience and I feel I made real progress because of her skills and dedication to the process. Abby tailored her teaching process to my unique needs and coached me not only on the tested topics but helped mold and develop my studying and testing skills. It not just about knowing the subject matter but everything including studying and how to take the test. Abby has it all nailed.

The Manhattan GMAT materials were extremely well done and provided a great resource for my preparation. The online recorded classes let me review material at my own pace. Enjoyable and well done. I especially liked the Manhattan GMAT Official Guide Question and Answer explanation utility "Archer".