Today I tried Four Sigmatic Focus high caffeine dark coffee. Of the brands of mushroom coffees that I've tried. Four Sigmatic is one my favorites. As I opened the bag there was a light chocolate nutty aroma. There wasn't that slightly bitter scent that I've noticed in some coffees.
The coffee grains seemed a little darker in color. Though I'm still getting accustomed to the lighting in my apartment. So it might just be the lighting, because i don't think it's noticeable in the picture.
In terms of dark coffee. I'd say this one is pretty mild. Though I don't mind it. Overall it was a good coffee. I don't know how to validate the caffeine levels. I don't really have a sensitivity to caffeine. Though overall I'm happy with it.
I tend to drink coffee regularly throughout my day. If I can supplement a few of those with a healthier choice. Then it's a win in my view.