@Danny,

I just wanted to go on record by saying that if you purchase a subscription you will not regret it. And David is always improving and upgrading. Also Popup has an actual pedagogical approach to learning which mirrors the way that he and Brendan learned Mandarin. Other Mandarin learning sites don't have such a clear approach to learning, they just put a bunch of lessons or study materials out there for you to forage through by yourself and offer little or no guidance. Besides that, the users on Popup are the best Mandarin learners that there are. Other sites may be more populated, but the vast majority of the users spend the vast majority of time posting things that are completely unrelated to learning Chinese.

On Popup, the great majority of posts have been about topics which can help us improve our knowledge of the language or Chinese culture.

My point here is that you will get actual community support and support from Echo and David themselves to speed you on your way to learning.

Besides, if you don't like the results, it's always backed by a money-back guarantee, so you've got nothing to worry about by trying it.