Can I disable pricing?

YES. Therefore we recommend to use the plugin with the delivered shortcodes, that allows to use the designer with simple form (name and email). If you want to create an advanced form with different form fields, you can easily connect the designer with Gravity Form, therefore you need the PLUS add-on.  

Does it come with some demo content?

Yes. The WordPress/WooCommerce plugin has a feature to load some demo products directly via the admin. The jQuery plugin comes with an example as well.