I just bought the Unicorn Magnun after seeing a review of pepper mills on Americas Test Kitchen. It is as good as they say. Pumps out a ton of uniform, perfectly ground pepper with just a few twists. Not cheap, but worth the money.
If I was to buy another, I might consider the taller one (Magnum Plus) as I assume that it holds more peppercorns. Not sure on the price difference between the two. The Magnum holds quite a bit, but it is so efficient at grinding that I am running out more often because I am using more fresh ground pepper rather than pre-ground.