Poorly built, miserably implemented.
Nice idea, but designed by someone used to working with DOS in the 1980s. First, the captcha code is unreadable and absurdly challenging for even the most technologically literate, let along the average bus user. Secondly, the infuriation message that my phone number is incorrect (I know my phone number) and no way to bypass this error. In short, 5 minutes into using it, straight to the bin. Waste of time.