We bought the Brita Marella Cool and yes, during the first uses the water has a slight bitterness – as if the filter is saying, "Good morning, try me a little before you fall in love with me." But a good rinse and the bitterness disappears almost immediately, as if it was embarrassed to show up in the first place.
From then on, the jug is really practical: ergonomic, fits comfortably in the fridge, and reminds you that hydration can be... stylish. The filtered water tastes much better than tap water and is ideal for coffee makers and kettles, because it keeps limescale away – meaning less battle with your descaler.
Overall: if you want water that not only quenches your thirst but also makes your plants' leaves jealous, this jug is an excellent choice.

The quality of the water is excellent, almost no salt. If you need water to drink only, for your coffee, maybe even for pasta, this is the solution. The other filters, on the faucet, etc. fill the sink with attachments and, if you don't have space on the kitchen counter, they become annoying. They also hinder the normal flow of unfiltered water. Brita again, Brita then!