About leaking - If you buy new, and you fill it with ink and leave it in upright position overnight and it doesn't leak, you should be fairly certain that it won't leak in your pocket, as long as you keep it upright i.e. nib pointing to the sky. Ebay pens can be problematic. If you fly, make sure the pen is upright, I have also put my pens in pen case horizontally during air travel and they are ok, but factory said you should keep it upright. When I fly I usually carry a ballpen, easier for the immigration/customs forms too.
Goto Fountain Pen Hospital as others suggested. They give approx 10-15% discounts on MB pens. Go there and spoil yourself
