Presently, I'm also going through the Knewton course.
Teaching style at Knewton:
Though Knewton teaches through online, but till now I never felt that I’m not class. Teachers are helping and try to solve each and every problem you face in class effectively.
I really liked Knewton. It gave me the flexibility to study at my own pace. It was extremely convenient and offered really good resources. It's also nice that you can watch all of the classes over again for the whole year.
Study material at Knewton:
There are more than 3400 questions to be solved in knewton course! 5 CATs nearer to the real GMAT. Knewton has good feature of pretest and retest (after the class) to know what you have gained in the class. The whole course consists of watching videos (live or pre-recorded) taking quizzes, doing homework, taking assignments; there is much to do with Knewton. I'm loving it!
Moreover, the questions are standardized and near to the real GMAT questions. Knewton has really a great staff supporting you all the time and responding to your emails within less than an hour! Yes, I got replies of my queries in less than an hour.
Knewton's 50 point money back guarantee is one of the best things of course. Knewton simple rocks!