I think this machine is very well designed to make basic tea earl gray type. By cons not change the temperature or duration of infusion. For green tea or oolong type go your way.
Moreover, it is not possible to restart the device to infuse her tea a second time in a row (for the Oolong tea is a bit longer). Certainly because the water is still hot.
So I have never managed to make a decent tea in ten essais.`
Another thing, the top of the teapot is made with a very basic plastic, so he turns yellow at first use, you can not get it back.
I sent the teapot Amazon after a week. As usual Amazon top service!
Conclusion: Definitely fine for a basic tea and thus 90% of people. Otherwise buy a teapot for changing the time and duration of infusion, but the device will also be much more expensive.