It's cheap and does what I need, keeps coffee warm for hours until you brew more. The main disadvantage is the seal/valve seat. This is something your disassembly will fail to clean up. They are supposed to sell pads but I have a feeling they don't. UPDATE: Five months later the dewar/vacuum flask is no longer used. The nipple from which the air was pumped out broke when cleaning and he. Now it's a soap bottle. Complete garbage. Coffee seals also get dirty easily, so it doesn't have to be high-quality silicone. I'll see if YETI or a reputable company makes anything in the $50-$75 range. This is a one-time block.
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