Tell me about Lumosity....

Does anyone here use Lumosity, the "brain training" site? It seems to be heavily advertised as a tool to keep cognitive skills fast and flexible as aging encroaches, but I haven't seen reports from users. It makes me a little uncomfortable that it functions on a monthly-fee subscription base, rather than as a self-contained package, and you have to actually create an account on their web site (which I haven't done) before you can get much information. So, is it a Good Thing? Does it do what it purports to do? Is it worth the money? Are there similar programs with cheaper fees or a one-time purchase price?

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