1 star because it claims to be 0.37 liters while the usable volume is 0.31 liters. 0.37 liters is without the lid, alternatively with the lid and filled up to the rim of the cap (to prevent spills) it is exactly 0.31 liters weighed.

I have been using it for about four years. I have never had any problems, either with leaks or with the durability and reliability of its construction. It requires a little attention when opening, without sudden and forceful movements, and everything is fine. Very good construction, with absorbent material at its base for grip on slippery surfaces and gentle deposition on sensitive surfaces such as glass. Perfect.