The lower settings seem to work on a timer basis similar to a non-induction microwave. High power for a few seconds followed by no power for a few seconds. This will make your small pot of liquid boil like crazy, then stop.. then boil like crazy then stop. Not ideal. Even on the lowest setting which is supposed to be only 100w... which it may be on average, but not at any instant.
I don't know if other portable induction cooktops also work this way as I have only used built-in models previously that have full turn down control. Sorry Ikea, I know this is cheap, but I was expecting better control. Its going back to the store.

I was looking for an induction cooktop which I use for cooking at remote places and I found this from.ikea..comparing with other induction cooktop there are.more expensive ones in the market but this is all you need,it's looks classy and works well..it's has child.lock feature as well and gets cooled down quite fast..

Heats up very quickly. Takes time to find the sweet spot for cooking. Simple saute around 3-4 setting.
Works best on my cast iron pan, Scanpan is a little slower I expect that is due to the fluted base of the Scanpan.
Small complaints is having hold the child lock on to start, the fan is on the loud side, and if use forget to turn it the unit off at the power point it will start up again as you clean. cooks food great though.