The new issue of MacFormat includes a review of Nisus Writer Pro. The review is not yet posted online, but I can tell you that it is in issue #186, page 85.
I can also tell you that out of a possible 5 stars, NW Pro receives 5 stars! It is a MacFormat Choice as well.
By the way, those of us in the US and Canada can pick up MacFormat in your local bookstore. Just sayin’ …