Very cool. I've never tried mushroom coffee but I have heard all about how good medicinal mushrooms are for you.
So my little input - in the past I have drunk dandelion coffee which I found delicious. I bought it as ready-to-brew roasted dandelion root, but I have also roasted my own dandelion roots, dug up from the garden by yours truly. While it may not have the benefits of medicinal mushrooms, dandelions are still really healthy and powerful for detoxification. Great for your kidneys. And - bonus - you can make it for free and avoid Amazon altogether!