TTP turned my Q43 into a Q50 in 1 month

Strengths:

Great lessons, interface, questions, there is everything you need at the pace you need, at the depth you need.

Would make the product better:

They could have mocks of their own. Create a new qbank dedicated to these mocks. This would be amazing because I've found only the 6 gmat prep mocks to be useful in the GMAT prep. We need another party making mocks that are actually gmat-like and from the quality of their questions it could be TTP.

This is the best bang for the buck if you like self-study like I do. There is everything here needed for you to get a Q50 or Q51. If you do not have a solid math base, the program will get you there. And if you have a solid base to start with, you can do like me (though it might not necessarily be their recommendation) and do the chapter tests and read the chapters as you need to refresh. There are three different difficulties (easy, medium, hard) for each of the topics and both PS and DS exercises. Doing their DS exercises was my prep for Data Sufficiency.

I also really liked the Sentence Correction course. The cherry on top is the fact that you can speak to a member of the staff at any time through their chat. I needed some guidance after taking the diagnostic prep and also needed general advice after taking my exam and they were very helpful.