Avoid like the plague
I foolishly tried their iq test on Facebook in a moment of madness and later discovered that they had signed me up for a monthly subscription without telling me. Their system denies that I have an account with them so I can't cancel online. I have requested that the payments be blocked by my payment provider but they haven't done it. I have emailed their support team and am waiting to hear back. This whole thing is obviously designed to make it hard to (a) know you have been signed up for something and (b) to cancel it.