Great Resource for ground up prep

Strengths:

TTP takes a holistic approach and has a very thorough guideline on GMAT. While working a full time job and being away from studies, TTP is just what I needed to make sure I had complete preparation

Would make the product better:

Adaptive scoring can be added to make the experience more authentic and more mocks would be beneficial

I would recommend TTP for anyone starting their GMAT prep. It has everything and the course structure is excellent. The quant section is great for anyone out of touch with maths. For the verbal, I found the answer explanations to be on point and especially the chapter tests were very helpful in reassessing problems and readjusting my prep.
In addition to that, please use the custom test feature as it allows you to make sure you can target your weakest segments. I got over my quant problems with this feature and was able to pin point a lot of knowledge gaps.
In summary, do not only go for the highest difficulty level questions and dedicate time to the course, It does pay off.