As others in turn wrote, the water would reinlaufen, I can not understand well. What I can imagine is that you might as full bangs the dishwasher, which then hits a glass to each other with this and it then comes to damage. Fogging of the glass from the inside, I could not hear well.
We've brought the cups for our Feuerzangenbowle. But we have also been drinking tea from it. If you see the glasses for the first time one thinks that reinpasst not much there because of the hollow space is so large. However, the not so. Neither the tea, even when Feuerzangenbowle had then feel that fits too little into the glass.
But what is true is that the glasses are all unique. At one point at the bottom of the glass bubbles is nice and flat, where it could be a bit grainy with another in turn. Me personally does not bother, because the point is small and is not noticed when put underneath. We then again several glasses bought later at Pearl and because the glass was then a glass of 6 ordered the handle slightly attacked. We have a set sent back. We had always ordered more than we actually need, so it was not so bad that we return a set.
So bottom line, the glasses are worthwhile. However, you have to make the expected times but one or two glasses are felt 50 that have a manufacturing defect, or returned by others were due to a shortage and have not been sorted out. I would not necessarily relate to the Qualtät the glass because I have also been observed in other articles.
The heat is really not passed the rest, so that the outer glass remains cold.