It's made of glass--you can get it really clean Makes good coffee You control the variables Good way to make sufficient coffee for your vacuum bottle
Negative Product Points
Glass can break but this seems to be resistant, at least for glass Filters are relatively expensive
I usually use this as per Chemex instructions and similarly to what many on here have already outlined. I heat a liter of water in my Breville hot pot. While that is heating I microwave 1 to 2 cups of water to preheat Chemex (I usually pour this through the filter. I do not seem to be sensitive the the paper taste anyway.) When my brew water is to temp, I use this same water to preheat my vacuum bottle. I get good results that way, but I do notice the last coffee through is not as dark or opaque as the first.
I occasionally use this as a full immersion device. Briefly, I microwave water to about 200°F in a heat resistant glass measuring cup. I stir in my coffee and cover. I'll stir every minute or so for about 3 minutes and allow the coffee to settle the final one minute. I then pour the coffee through the filter. In principle, I like this full immersion method. Since the extracted coffee mixture stays in contact with the ground coffee, there is less chance of over extracting. Second, since I am decanting the coffee it filters more rapidly.
In contrast, the pour over method exposes fresh water to the grounds. There is more of a chance of over extracting. For me, I detect no difference between the two methods. I like good coffee, but I guess I haven't trained myself to distinguish the subtleties. As a thought process I do like the idea of treating brewing the coffee and separating out the solids as two separate steps.
I frequently wash the filters for reuse. Counting shipping, these cost 15¢ a piece plus it's a sizable amount of high quality paper. I'm the only coffee drinker in our house, so I will go directly to a vacuum bottle. I have one of the Zojirushi 1 liter bottles. It's then very easy to portion out 4 to 12 oz servings, depending on how much time I have to enjoy a cup. I find that these vacuum bottles keep coffee quite acceptable for at least 4 hours.
Amazon works. They are not personal like the coffee specialty shops, but I knew what I wanted.