TTP = 1 stop shop

Strengths:

-THOUSANDS of problems, it's all you need
-Wide coverage of all sections
-Wide range of supplements

Would make the product better:

-Recommend sections for students to take based on their strong/weak sections
-provide practice tests

I was recommended TTP by my coworkers, and despite friends recommending different websites, I decided to pick it due to its "comprehensiveness," per my coworkers' wording.

After completing the majority of the course, I can testify that "comprehensive" is indeed the right word for this course. With the exception of practice tests, it has everything (and I mean everything) you need to succeed. There was no point during my study where I considered getting a supplemental practice course from a different provider.

You get access to formula sheets, flashcards, hundreds (1000+?) of questions, and a myriad of lessons. You can opt in for the instructor learning too, but I personally did not. As long as you're motivated and focused, I don't feel like it's necessary.

My one warning is that you should be prepared to dedicate a lot of time -- depending on how far you are from your desired score, if you're in a rush (<6 months) to improve, there might be too much content for you. Otherwise, think less and just get TTP.