This feels like Mint.com all over again. I do not feel comfortable sharing personal banking data with a hosted platform. We all know what happened when Mint sold out to Intuit!
Not sure about your personal experience but it was only a matter of time until I started receiving promotional offers from various credit card companies based on my spending habits via snail mail. I could directly tie them to Mint.com becuase I was shown the exact same offers on their portal. What other proof do you need?