I am a chronic pen twirler so the weight of the pen and the distribution of said weight makes a big difference to me as well. Pens that are too light feel too flippy (technical term) when you twirl them.
Wow, a fellow twirler! I too strongly consider the weight distribution and "twirl-ability" of my pens. In fact, I have my favourite writing pens, but I always keep a Pilot G2 because it's been my favourite twirling pen for many years.
