Hi Emily,
Thanks for checking out our plugins!
With Event Tickets Plus, tickets are essentially WooCommerce simple products, but there is not currently support for making tickets variable products. To create different ticket options, you would need to create separate tickets. However, you could potentially use some third-party plugins for/by WooCommerce to extend ticket functionality.
Regarding attendee data, Event Tickets Plus lets you create custom fields that you can use to collect additional info from attendees.
There is not currently a demo site for the backend, but we do offer full refunds within 30 days of purchase, so feel free to test out any of our premium extensions! I would also recommend taking a look at the following articles for more details on ticket features and options:
New User Primer: Event Tickets and Event Tickets Plus
Settings Overview: Event Tickets and Event Tickets Plus
Managing Your Orders and Attendees
Moving Tickets
Please let me know if you have any other questions!
Thanks,
Jennifer