I haven't tested to see if the temperatures are correct, however it does seem right for coffee. I didn't find it super fast to boil, but it is faster than my old kettle. Also it is a lot quieter. Cant see why people had problems with the buttons sticking, but it could happen if you are very heavy handed. The beeps are great, and not too loud. They tell me that I have placed the kettle on the stand correctly, and the two beeps when the kettle has boiled helps remind me to make my cuppa. All in all, I would recommend this kettle.