I have been a user for about six months. I really like it! In my opinion, it is most certainly NOT a scam. I have not had any issue with billing (I paid for a year after trying it for free on my iPad, and did not sign up for "automatic renewal," so I haven't yet gotten to any potential issue on that). The service is MUCH better on the computer than on the iPad. The iPad games are well-designed, but there just aren't very many of them (maybe 12 compared to around 40?). So, if you only want to use your iPad for these types of games, I wouldn't recommend signing up. There is a wide variety of games on the computer, though. They focus on five different areas of "brain power." While I don't know if it's actually building brain power, I don't think it is hurting me, and I really do enjoy a lot of the games. The "train game" is completely addictive!