Sadly I'm not convinced.
- I find Darwin much slower than using gmail in a Chrome tab. The fact that you can access all your accounts under one tab is not faster than having several tabs opened.
- Displaying the email content is slower.
- Loading other emails is way too slow. Unbearably slow. I receive thousands of emails, I don't have time to wait for an app to load them. My eye is faster than that.
- Attachments preview is not available
- Bundles don't work as expected. For instance, emails from my bank are not categorized as Finance. But when I try to edit the bundles for this sender, Darwin will show me Forum, Promotions, Social and Update or Let the Darwin Algorithm Decide. But no Finance. Therefore I have to create a user bundle for this.

Overall, Darwin is not solving any problem for me and is making my workflow slower.
Going to have to get a refund.