I like being able to fill the kettle yet only use a small amount at a time. The kettle can be heavy and probably difficult for those with weak wrists/arthritis. Boils quite quickly and easy to see how much is in the holding tank and how much in the 'kettle' for boiling. 360 degree base. Lid could be easier to open but it hasn't been a problem. Could be a problem for anyone with some immobility in their hands.
For economy, I like the kettle but I can see places where the design could be improved for some users. I don't think I would consider buying if I had a family or regularly boiled large quantities of water.