Thanks for your feedback. To answer your questions:

- The reminder is not optional.

- Yes, you can do all that you mentioned in the admin.

- This is a fully working product. If you sign up, you can see the admin right away. Perhaps I should add a link to a demo admin area.

- I'm not sure what you're suggesting about the lack of a monthly fee. Can you explain some more?

- I don't think this competes with patio11's product. As far as I know, customers do not use his product to schedule appointments.