I seldom offer an unsolicited opinion but when I saw the reviews posted on your site I decided I would. First, 50,000,000 people use it. That is an incredible number and the quality of Lumosity's program based on this alone speaks so loudly I can't hear what the naysayers are saying. 2nd, Since the beginning of time the almost urgent recommendation from the medical community has been to continue to use your brain for something besides tv or the latest spy novel. Crosswords Soduko, brain teasers are all helpful. But Lumosity offers so much more. Structure, accountability, challenge, and fun. And I've never had any problems with the service. Zero, it's always been 100%