Extremely useful for productive studying!

Magoosh was a great tool. I took it in combination with a GMAT course, but ended up using Magoosh more heavily than any resources through the other course. The tutorial videos are brief and succinct, and the video and text explanations for every practice question were hugely helpful. Magoosh has practice tests, but also customized practice, so you can work on your timing for the exam in sets of 20 or 30 minutes, for example. What's especially helpful is that you can track your progress, and see any patterns of errors coming out of your practice. I would definitely recommend Magoosh for anyone thinking of taking the GMAT. Magoosh makes it incredibly easy to get started studying, and to keep studying.