I bought the blue kettle which is lovely to look at and performs really well. The base fits perfectly in the smaller electric heating units on the glass stove top so there is not shaking at all.  It was the shaking of  my previous kettle -which had too many ridges on its base-  was what made me look for another one. This kettle fits well onto the burner, does not move while heating, and it heats well and rather fast. I like the old fashion design: it is easy both to fill and to pour from it. I recommend it.