How many cups of coffee do you make? The problem with the thermos is that if you only make a small amount of coffee, the thermos is too large to really keep the coffee hot. I also think that the thermos pours oddly when you have a small amount of coffee in it. I have used hot water in the thermos to heat it up before using it and that helps some. If you are making a lot of coffee, then the system works great. The actual coffee maker/grinder is very efficient . I have used it with paper filters and with the gold filter. The gold filter fits the container better and is a good investment.