Chemicals could mess with my coffee every morning added when I pour hot water on the plastic. This cone makes a great cup of coffee, smooth and rich (I use about 2 teaspoons per mug, three for a large travel mug) and I can drink it without worrying about chemicals. It's also slightly faster than the plastic. I love the windows that show how full the mug is - that's a great idea and I don't know why all the cones don't have them! My only issue is that the base isn't very versatile and fits a lot of different cup sizes. . It's too small for my wide Ikea coffee mugs which are almost 4 inches wide. I can kinda pass it by, but of two tries with these mugs, it fell the second time, spilling coffee all over the counter and up my sleeve. It's too wide for my 2.5 inch travel mug (Contigo) because the inner ring of the base is the same size as the rim of the mug. I get it to work by stacking it on top, but it can easily fall over if I'm not careful. I'm definitely not going to resort to the plastic cone, but at least it's versatile enough to work with all cups. I should have measured my mugs before purchasing. However, with so much variety in mug designs/mug sizes, I find it a design flaw that they aren't more versatile. If it matched my mugs I would give it 5 stars because it's a great cup of coffee and I love the windows.
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