Cumbersome. Someone wrote in their review that its so easy, only an idiot couldnt use it.. (or something like that). This app is so anti-"app" that I say only an idiot would use it. Hey geniuses at Check-in, how about making it so we can log-in right from the app and not have us go to your internet site. Also, dont advertise that you can just upload an excel file if one must also have to do this from the internet site. Your method is clunky at best. Lastly, after having registered, I tried to log in but... surprise... it was not recognizing my username.