In a previous review I've read that some are not satisfied with the hygiene because food gets stuck in the seal, so I was skeptical at first. From this experience, but you should not be deterred from buying itself - the sealing ring can be removed (and again draufmachen) and clean separately easily. The thermos box we've purged both in the dishwasher as well as by hand. The two go very well.
So I can fully recommend the Box.