Great for math basics, mid for verbal

Strengths:

Great for re-learning math basics and getting a simple walkthrough of important principles. Also good structure for those who rely on that as they prep.

Would make the product better:

Verbal leaves something to be desired--lots of erroneous answers, and not much variety.

Really great for a clear, simple, structured approach to GMAT prep for those just getting started. If you're looking to relearn the basics of math, their explanations (and interface) is stellar--I especially like the encyclopedic layout of all the math concept videos.

However, if verbal is where you're focusing, look elsewhere. I didn't find their verbal to be helpful anywhere past the 650+ level. Plus, their practice test score estimates are well, well below where you end up (e.g. 100+ point gap between their estimate and an official test the next week).

Good for people just getting started, but if you're past that--pursue other prep materials.