I took the Knewton online course after my first attempt at the GMAT. The course materials and instructional videos really taught me how to tackle the verbal part of the GMAT, as evidenced by the 7 point jump in my raw score.
The quant part was ok, but the questions were not as rigorous as I had hoped. I would say that the quant questions are of 650 level difficulty. ManhattanGMAT is better for quant preparation. Still, you can't argue with a quant score of 50. As far as homework is concerned, I would say that I did about 4-6 hours a week, and still managed to finish the course in about 9 weeks.
Overall, as you can see from my score improvement, I would definitely recommend Knewton to others! One thing I would add is that you only have 4 months of online access for Knewton once you sign up.
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