I've had a Brita filter mug for years! The Marella is probably my 4th. I use it mainly for the kettle when making hot for making hot drinks. The filtered water makes a great difference to the taste of tea! The mug is easy to fill, has an automatic time counter and is easy to change the filter. The only problem I find is that because the outer mug is clear plastic I get a small build up of green algae between the collection mug and the inner filling jug. It would help if the outer mug was coloured.