I am not sure how this one works or how it switches from one system to the next, but I also know some people might be in dire need for it. Reason is simple, with many having unforeseen expenditures, credit is heaven-sent, for other situations when they do not wish to pay interest on something they can afford, debit is it. So it is a 2 in 1 solution. Once more, it might not be for everyone but am sure it has its audience.