Very good and more effective than the classic back cisterns. It releases water with more pressure and doesn't accumulate limescale as easily. We replaced a regular back cistern with a round one because we have very hard water in the area, and the plumber was indeed right. The water flows out forcefully and doesn't allow limescale to build up at the bottom of the cistern. After a year, it works flawlessly and without limescale at the bottom, while with a classic back cistern, we had to open it every 2-3 months and scrape out the salt that built up at the bottom because it clogged the mechanism and the water wouldn't flow. (I'm talking about an expensive back cistern, not a cheap one). Anyone with hard water in their area or living on an island will be saved. The white looks nicer to the eye, and if you take care of it and keep it clean, it doesn't look shabby.