One stop for strategic GMAT prep!

Strengths:

1) Excellent topic structure - allows you to understand where you are in the weeds of the GMAT topics,
2) Practice oriented - you can really dedicate 90% of your time to solving problems, not reading theory
3) Subtopic markdown of each question allows you to see your weak spots and practice them in a targeted way - this is why it's TARGET test prep!

Would make the product better:

Market the 6-month subscription more! It's really the best for most people, feels like it.
I paid for the 4 month bundle in an attempt to save, ended up preparing for 9 months, and slightly overpaying for the product.

1) The course is structured around particular topics, and the sequence is built step by step. So, there is no guessing what you need to do next! But you can also jump around later in the prep, to strengthen a particular topic.
2) Practice customization. There are step by step lessons, where each lesson has its problems from easy to hard. But there is also labeling per question TYPE. So, if I am stuck on the 'count the number of factors' questions, I don't have to re-do the entire Quant, or even 'Properties of numbers' topic.
3) Built-in videos really replace private tutoring! Most questions have a video recording of the solution. So, when you have no clue, you can follow step by step 2-5 min explanation. And you only do this for the questions YOU need, no go through hour long typical video course.
4) A wide choice of easy to hard topic tests that allow you to practice until you can't get a question wrong.

Btw, TTP is a philosophy of prep, not just a provider: practice, until you absolutely can't get it wrong. This way, easy and medium questions become your familiar bros, which you're happy and confident to tackle on the test!