Well worth the cost

I did a 9-week GMAT prep course in person and highly recommend it to anybody who's on the fence about taking an in-person class. I also hit the jackpot with Ryan Jacobs as an instructor. He's extremely good, he handles a class of mixed abilities very well, and I really felt that he added a ton of value beyond what you can get from self-study using all the Manhattan GMAT materials. Definitely worth the (quite high) expense of the class, and it paid dividends in the score I ended up getting. Manhattan also offers other services beyond the 9-week course -- you can schedule a "Post-Course Assessment" and create a post-course self-study plan leading up to your test date. I found all the materials, services, and classes extremely helpful.