I have been using one at work for a few weeks now.
It is not PID controlled, so it does not hold a temp +/- a degree like a PID would.
First it goes to boil, then it starts dropping. When it gets around 5 deg below the target temp, it reheats again.
So, it is not ideal, but it works for me. I turn it on, and wait for it to beep, a few mins. later the temp is down to between 205 and 200, and I make my coffee.
My one other issue with the this kettle is the lip on top makes it hard to emtpy all the water out at night, when I want to let it dry out.
Even with these issues, I am glad I have it, at least I know what the water temp is when I make my coffee. Between this, a CCD and a Virtuoso grinder, my work coffee is pretty good these days.
Randy