I like that you can check for errors in the registration form before you submit it, as well as get an email notification when there are any changes made. This is helpful if you have lots of guests/attendees - it makes things easier. It would be great if you could add additional fields for extra questions to your registration forms. There are times when we want to use a different email address than the one on file with us, but it's not possible. We've been able to make data entry much more efficient this way!