Anyone direct selling through Fourthwall?

I saw through a recent newsletter from Bookfunnel that they are now integrating with sales through Fourthwall. I knew nothing about Fourthwall so I checked into it a little. It sounds like a perfect platform for a newbie author to offer their print books via direct sales to readers.

Fourthwall charges no monthly or annual fees, and just a basic 3% + $0.30 for each sale, and they collect and submit sales tax. I can imagine putting a button on my website for direct sales of author-signed print editions of my novel.

Have any of you used Fourthwall for direct sales of either print or digital books? And what do you think of it?