I've gone through a lot of pens in my time and I have come to one conclusion- any pen that is not a Fisher Bullet is a complete waste of time and space.
But then, I use mine in extreme temperatures (+40C to -40C), in the snow, in the rain, the freezing rain.... you name it, I have written in it. If you aren't expecting to use it in those kinds of situations then I suppose that opens the field up a bit.
Def