Focal tweeters are not HARSH, they are lively, depends from person to person, some people like their music pretty dead and laid back, some like the funk, for the people who like a little lively music, Focal caters to them, on most online reviews the basic problem which people face, which tends them to say that focal tweets are harsh, is the fact that they use the tweets on axis, focal tweets are supposed to be used off axis.
Listen to fusion or pioneer tweeters those are even more bright, but people still buy them, and say for instance morels, they are dull and laid back compared to focals, but people who have those kinds of a listening preferences, would buy them.
Im using focals with ss ref, and trust me, they are anythin from harsh, they blend perfectly between being mellow and lively. I love the combo and it puts a big smile on my face when ever i listen to it.