Used to be powerful and saving strokes in three languages at the same time. After Microsoft took over, the decline started. I am not a Linux fan or something... Now it simply does not work. It does not recognize switching, it proposes the right word once in a hundred, it barely saves a few tapping. I just keep it because I become too used to the layout and theme I've chosen years ago. Remotely related to the original SwiftKey keyboard. I could have put zero if it would have been possible.