The price of the model above has been reduced lately. It is a few years old, but ours has needed no repairs since we purchased it in '09. Browse other models or brands for more information from Amazons good review system.
The electromagnetic field (EMF) can be adjusted to 18 levels. If the pan is removed the "burner" shuts off. You can immediately touch the burner and it will be cool. There is no waste of energy because none is needlessly lost in transfer from heating coil to pan or flame to pan. It is so efficient two quarts of water will boil in one minute. Gas has 40% efficiency while induction is rated 83-90% per Wikipedia.
With the 18 levels of heat just press the pad and go up or down, the heat is instantly adjusted under the pot. In the picture below Hungarian goulash is simmering at a level 3 in an enamel clad iron pot. I checked the progress of the goulash. Under the lid I saw tiny bubbles indicating a low simmer, but they were not just in the middle they appeared evenly throughout the stew. I could see that I would not have to check and stir as often because the whole area was getting the benefit of the disbursed simmer. This is an advantage over gas.The beef was tender in an hour.