except for my M90. This one especially since the barrel is already so hefty. I think WG for me - but I always prefer non metal for long periods of writing.
Despite having many Montblanc pens from the "Solitaire" line (those made in metal), I still use my resin based pens most of the time. My every-day pen is still my basic LeGrand 146 fountain pen in black resin.