Manhattan GMAT- The Gold Standard

My biggest GMAT mistake was trying to glean insights from all the different test prep companies. I would be on Kaplan, Princeton, MGMAT, Magoosh, amongst others reading and trying new strategies. I'm here to save you a LOT of time. If you are serious about scoring 90th percentile of better (or for that matter 80th or better), you MUST go with Manhattan. No other tests are more accurate or will kick your butt like MGMAT.
The Veritas and Kaplan tests were usually very poor at mimicking the actual test and often inflated my scores (I was scoring 720s easily which was incredibly wrong.)
Manhattan's quant is the gold standard. It will be the toughest and hardest, but if you are serious about improving quant, Manhattan will get you there. Plus the suite of online tools they provide with their classes is second to none.
Additionally, their verbal was best at mimicking the actual GMAT and was strong enough to challenge a high verbal scorer like myself.
Manhattan will give you that test day pop- you will score higher on test day than your practices. Why? Manhattan will challenge and prepare you so well that when you try the actual test, you may find it mildly easier! So do not be discouraged if Manhattan kicks your butt, cause it did the same to me. (I saw a 20 point test day pop which is HUGE.)
Quick comment on my instructors, they were AWESOME and full of energy. But the competitive advantage isn't necessarily the class itself, but the high well organized study strategies and software they provide which give you a clear and crisp study roadmap.
In conclusion, I went from 550 after 6 months of self study, to 700 after the MGMAT class. Disclaimer- you MUST be a self starter and self motivated to get the most from it. But, if you are, do not skimp based on price. During my first round, I tried to go with the cheapest options- big mistake. Go with the gold standard. Manhattan has the best online tools, strategies, and tests in the business hands down! After experiencing both sides, I'm now a believer.