I often mix stuff into my coffee: cream, coconut oil, medium chain triglycerides, taurine, even some resistant starches like inulin as part of my low carb life. Previoius to getting the slickfroth, I had to choose between a small hand blender or a spoon. I did not expect much (you know, a battery powered small toy) but I have found that this device works much better than I expected as a mini-handblender for liquids and powders. While it will not chop up the contents of thick smoothies, it will mix liquids together or powders into liquids very well. It offers a very useful tool in-between a hand blender (over-kill for many situations) and just mixing with a spoon (often not adequate).
A cool tool is anything useful that is superior to comparable items. If you think this tool is inferior suggest a better one. You are welcome to insult a tool, but comments containing insults to individual people will be deleted. Corrections of fact are always welcomed, if stated politely. Recommendations of better tools are dearly wanted and may be elevated to the front page.