Well... I don't use my late grandmother's Montblanc #32, even though it has a great OB nib, because it has some little cracks around the ink window, and because I'm very afraid of losing it.
I also have a Pelikan 620 Berlin that I just haven't filled for the first time yet. I bought it in December 2006 with some birthday money (right around the same time I bought a transparent-blue FP/BP M600 set and a tortoise-and-brown FP/BP M400 set), and every time I take it out, I just look at it some and put it back in its box. I'll start using it sometime, but its time hasn't come yet...