You know what I HATE? I mean, REALLY REALLY hate?
They are like the gayest things ever.
First of all, you cannot possibly write with them without snapping off the tip unless you limpwrist and write super light.
Second, I hate how when you push the button to extend the lead, you cannot control how much of it emerges. So either you write with an eensy little stub, or you push the button and it pushes out like an inch of lead which instantly snaps.
Third, I go through a stick of that lead through the course of one crossword puzzle- I can't imagine how many times people must refill them.
And fourth, I can't think of a fussier, more useless thing in the world than a mechanical pencil. Why mechanize it in the first place? Why not just use a perfectly serviceable actual pencil?
Seriously, just thinking about writing with a mechanical pencil puts me into a rage. My blood pressure goes up and I get hot with the memory of trying to take a standardized test with one and snapping the lead over and over while trying to fill in ovals.
GRRRRRRR, mechanical pencils. They just piss me off.