I'm really glad to help.
I've been using NW(P) since it was first available on OS-X I didn't use Nisus Claasic, though I had it, as I was using Word 5.1a (the last good version of Word in my opinion!), but I did get Nisus installed on 24 Macs at the School of Languages where I was working so that students of Arabic and Chinese in particular had a truly viable word processing system (early 90's when the PC labs were still running MS-DOS!); but it misfired slightly in that the news of our lab of Macs spread across the university and the lab was taken up much of the time by students from other faculties. And I've been using Scrivener since January 2007.
I would be desperate without them both, so I'm really happy to help anyone, particularly anyone using the two in combination.
Mark