One of the best features of this kettle, other than how quiet it is, is hidden inside it! When filling it with just a little water for one or two cups, there are level indicators very prominently inside which are easy to see and mean you don't have to either guess or keep holding it up to see the level viewing window! 
It boils fairly quickly but does seem to keep boiling for an extended period before switching off during which time, if the kettle is full, it does seem to jiggle around quite a lot. This is the only reason I have deducted a star, other than this, which might be a personal preference issue, it is a very good kettle!
The scale filter is easy to remove, replace and clean which is great for us as we live in an area which has very hard water.