All of the sites negative reviews are not fair, the thing is:
Ive been on lumosity for two months, and I'm a student and I feel there's so much more I now learn, I havn't tried their custumer service, since I've had absolutely no problems with the website. But, as some reviews say it is thin on content to their mobile app. But if you feel like you want to train and get better you should absolutely sign up for their free trials.