(OK, perhaps a little off-topic on these forums, but still of interest to many, I hope...)
Of course, as far as fountain pens go, I'm loyal to my old Pelikan M300 F. It's a true workhorse, but, like most fountain pens, it isn't disposable, and its ink can be messy and slow to dry.
As far as disposables go, I'm rather fond of the Uniball Signo Micro 207. Smooth as silk and resists smudging.
That said, we all love letters, and we've discussed handwriting before, so...
What disposable pen do you prefer? (And I mean for its quality, not for its convenience or low cost.)
I've yet to find a disposable with a flat nib like a fountain pen (for those great thick-thin stroke variations we all crave). Any recommendations?