The most comprehensive GMAT prep course indeed.

Highly recommended for "learning” the concepts. I would suggest going for the entire thing which includes Quant and Verbal. It covers exceptionally important yet often overlooked skills such as reading (in its Master Comprehension tutorials) that are absolutely critical on all the GMAT sections and helps you hone specific skills with its endlessly customizable quiz builder (Scholaranium). It's easily the most well thought-out and one of the most comprehensive online courses out there and is well worth the investment.
One of the amazing things that e-GMAT did was get me into a habit of following their 3-step process to answer a question and maintain an error log.
The prompt doubt solving and the sigma mocks were simply amazing. Ask anything you want on the forum and you'd get an apt and detailed reply within the day. It never took me longer than that to reach them for any issues I had. The interactive user experience is one of the bests I've seen and it would facilitate your learning for sure!