So far we've signed up and tested Darwin mail's free version using Brave browser. The layout looks very familiar to the now defunct Inbox by Google. Great job with the design and familiarity. In talking through the service, we've found that it is slow on mobile at this stage in the development. At one point the menu under your Google photo (the one with settings in it) got stuck on the screen even when opening the side menu with drafts, sent, etc. was open. Another thing we noticed and would like changed is that if you click drafts our sent mail or another category, you have to click again to close the side menu to see your chosen category. These are all things I think will be fixed soon if development persists. The one thing that's going to be interesting to see how it turns out it's the bundling. Hopefully he'll get it right!