it's good if you want to organize your bills by due dates and the type of collector (cable, cell phone, electricity company, etc...) along with their info (mailing address, websites). you can set a reminder date for your bills too, say 5 days or 10 days in advance. so once you open the app, it'll pop a reminder (badge) on the icon (like a missed phone call or a new email). so that feature is pretty nice. i wish it can update automatically without having to open the app first.
aside from that, you can just use the standard notes program from apple and jot down the due dates of each bill and use that as a reminder...