I got a 740 with TTP!

Strengths:

TTP is extremely comprehensive and goes through each concept with extreme detail. There are loads of questions for each topic. The team is really helpful and responsive. You can go at your own pace and the custom tests are helpful.

Would make the product better:

The questions could be closer to the official GMAT questions. You still need a little bit of supplementing with OG questions for full preparation. More verbal questions could be good.

Target Test Prep is extremely comprehensive and goes through each concept with extreme detail. There are loads of questions for each topic. The team is really helpful and responsive. You can go at your own pace and the custom tests are helpful. It's important that you dedicate a lot of time to your GMAT Prep. I would recommend at minimum 4 months of TTP to get through all the modules. It took me a total of 6 months to complete the whole course. The types of problems are similar to the official questions, but overall they could be a little bit closer.