I bought this for my husband and I haven't heard him complain. My husband drinks a protein shake every day. I think they are good. Sometimes I use them to make pancakes too. No leaks as long as I shake the batter. (It sure holds a cup of flour, a cup of water, and an egg. Enough to make pancakes for two) We put them in the dishwasher. It's been about six months since we received them. I don't see any signs of use.
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