A small drawback is me yet noticed, which is why I forgive only 4 stars: The opening is not placed in a corner, so it is difficult to completely empty the canister (liquid flows known always the lowest point). By gently shaking the canister you can indeed almost completely empty, but I find that a bit of a chore. I guess that remain without shaking approximately 0.2 l in the liquid in the canister. It would be much more pleasant if we could completely empty the canister without shaking.
All in all, but anyway thumbs up and an absolute buy recommendation on my part!