I'd like to add my own piece of feedback regarding Knewton. I did not buy the full course, but I enlisted for the free trial period. The first thing I liked about Knewton was their user-friendly site. I do believe that first impressions count and for me, it was a pretty good one. I also participated in two live classes and thought the instructors were fun, smart and had solid knowledge of the test.
However, there are a few things I will complain about. First off, their test. I took the free test something like one week before the real thing and was disappointed with the results: 710 (q43, v45). This score was just 10 points higher than my very first CAT (GMATprep 1, before I started researching the GMAT)! I'm pretty sure that three mistakes in verbal won't add up to a score of 45, but what the hell... It kind of took me by surprise, but I decided not to let it get to me. I am therefore inclined to subscribe to the general opinion that their algorithm needs work, but since I've only taken one test, I can't really say for sure. I understand the CEO is a former
Kaplan employee and we all know that the free
Kaplan test provides significantly lower scores than what you should expect...
But my biggest complaint is about the verbal questions. I don't know, but it just doesn't seem fair to me to blatantly rip off
OG questions. The structure is absolutely the same, which is a big annoyance to people like me who obsess about CR. Let me give you an example: there's this one question in the
OG 11 about Native American tribes; you'll see the exact same question, but with Native Americans replaced by Amazonians! It's just not fair, IMHO, and I'm actually curious whether they could be accused of copyright infringement.
Overall, I guess I would rate them positively, though, just because they're trying a new thing to the legions of online courses: the TA approach, the adaptive system... Maybe this all balances out the unimaginative question "design".