I have had a 240V Advantium for only 3 months now, and so far the most notable success in using the Speedcook function has been roasting a 4.5 lb. chicken in 25 minutes. We use the microwave feature the most often, and we've also used the proof function. We like it much better than the 120V version it replaced. Drawbacks - not self cleaning, and the light doesn't stay on so that you can monitor cooking. In my experience, you can only turn it on a limited amount of times when microwaving, I assume because it is the halogen light.