It's easy to use and easy to read the buttons, the water heats quickly and it's fairly easy to view the water level. I did a test with a cooking thermometer. It seems that the water closest to the bottom was at or near the temp selected. Moving the thermometer and holding it closer to the top gave greater differences in temps, and after pouring it into a ceramic cup brought the temps down much further. If having the water at the desired temps in your cup is important, you might want to do some research on this. It's a kind of pricey device for just heating water, although even with that in mind & after my testing, I'm still glad I bought it. It's very convenient while working at home & Im staying better hydrated than I was without it.