The Bricks Builder is both a WordPress theme and a block-based page builder. It was made by Thomas Ehrig and Luis Godinho.
I found the editor easy to use. However, this introductory video helped quite a bit. There’s also a live demo of Bricks.
The Bricks Builder price is $99 for one site lifetime license, and $299 buys you a license to use it on unlimited sites. You can get a refund on the lifetime licenses. the developer says:
[W]e’ll keep this lifetime offer and your refund options open until we’ve implemented enough initial feedback that we feel it’s a solid solution for professional users. We’ll notify all customers & newsletter subscribers via email before we update this refund policy. If you want to contribute to Bricks in its early days, we’d love to see you join the family 🙂