I think your experience depends entirely on whether you have flown FC on other carriers, and how much have you done that.

I am tempted to advise you not to expect too much, but then again I remember the first time I was in First Class. It was definitely exciting! Now I'm so used to it that it's all not that special; in fact I can think of some improvements that could be done. I sill think FC on NW is a very decent product!