It's nice to have a post consolidating all the information and reviews. Thank you!

Heres my review on Knewton

The Positives :

1) Very helpful set of people. They reply back to all your queries with a lot of detail and you can expect most responses back within 24 hours. I have got responses on Sunday as well, at times.

2) Online learning works . Their site is adaptive, and it generally throws questions to you which it feels you are weaker on.

3) 50 pt guarantee should work for most. I improved my score by 60 points from 660 to 720. Also I had a balanced score as Knewton focuses equally on Quant and Verbal . I have read that a lopsided high score is inferior to a balanced score with the same total.

4) Although many people feel that Knewtons questions are a rip off of the Official material, this strategy works. They drill the Test Prep Makers strategies into your head, and you are far better off doing questions that are similiar to those that you will see on the exam. The SC in verbal were a breeze, as I could spot most errors with ease.

6) Their Quant Strategy and Verbal strategy sections are excellent. They do significantly improve your skills at choosing the correct answer, or atleast chosing between 2 answers , when you are in doubt.

7) Despite many complaining that Knewton Diagnostic isnt a valid interpretation of your actual ability , the truth is that my final scores are more in line with their tests than the Official Gmatprep. This is also because many GMATPrep problems are already tackled by most of us on this forum or in the Vebal and Quant guides, while practicing.

Again for the money back guarantee , they chose the highest of your two previous scores. Either the Offical GMAT or their diagnostic.. So if you score a 660 on their test and have scored 690 on your actual test , earlier , your money back guarantee is based on your baseline of 690.
They could have very easily selected to use the lower of both scores, or just use their diagnostic for the money back guarantee. The fact that they used thehigher score means that they are confident in their material and techniques, and the overall Knewton product. I feel very comfortable in recommending Knewton to any future candidate looking for a one- two month testprep.
8) Instructors on Knewton are top notch, and the live sessions are fabulous. I attend the classes twice. Once live and once I went through the archives. It definiately helped. On many ocassions the TA spent more than 20 minutes with me after class to take me through individual concepts.

9) The guys are value for money. The course isnt expensive, given the fact that they have been offering discounts on most courses off late.

10) Videos of most individual topics , where you are weak, are an excellent way to strengthen your concepts.

11) You cant rewind a live class, but at Knewton you can see atleast two archived lessons on each class, with different instructors, and also attend a live class in addition to that.

12) Last but noth the least, Knewton promises a live Pre MBA class, which will include a live case study discussion with a Harvard Business School professor. This Pre MBA program will be offered free with their already excellent GMAT training package, making it one of the unique combinations in comparison to other GMAT training programs.

Negatives

1) The Quant sections on Knewton tests are simpler than the actual GMAT. I was able to complete all tests with 5 minutes to spare, but on my actual GMAT I was in a tight spot , trying to rush through the last few questions in Quant. I have read that their GMAT Quant questions are being revised for their CAT's to have them be as tough as those seen in the actual CAT's


Overall Review

Can confidently recommend Knewton to any candidate looking at improving his test score. They deserve a 5/5 . But Ill give them a 4.5, because they can still improve on the Quant practice tests.

Again with their killer money back guarantee , there will be no reason to regret joining Knewton . I can vouch for their program's efficacy.

Have not hear of TestMasters for a long time. They still around? Anything good?
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Very nice review. I am planning to retake and Knewton looks like a road to me...

I am sorry to hear about that. I thought the GMATPreps is a good indicator. I haven't taken the real test yet, still practicing. What do you think is the main different when you take the real test?

Great! I will be sure to practice properly. Thanks

So, do you think the GMATPreps is a good indicator for your actually score? or was it way easier than the real test?

After throughly analysing the reviews, I have enrolled myself in Knewton. Let us see how far it goes and I hope I can write a success story here.

I partially took a Manhattan GMAT course. I say partially because I didn't really avail myself mentally. I think that the materials are great but that one should do preliminary prep before enrolling in any course. It gives you a better idea of what you're dealing with content wise and also helps prepare you to be a better student, one who can truly take advantage of the knowledgebase of course instructors and tutors.

One advantage you have with Knewton is the 50-point money back guarantee (if you don't get 740, you get your money back). You will also get GMAT Club tests for free if you use our promo code to sign up (GC-Knewton-GMAT).

As to others, I have not taken any, so you have to rely on the feedback from reviews to make your selection.

Finally, consider browsing through this thread: should-i-retake-gmat-thread-retaking-gmat-strategies-83339.html
Do you really need to bump your score more?
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