I've had the PID enabled version of Quick Mill Carola for a few years now, and I don't think I would recommend it. The #1 issue for me is the water reservoir and associated fill sensor. The water reservoir is too difficult to refill, too difficult to see how full it is, and the water sensor is really unreliable and will beep loudly and prevent warm up even when the machine is full. I ended up disabling the sensor. I won't be getting rid of my Carola, but I think there are better choices now, something like the ECM Puristika, perhaps.
