http://www.coffee.org/Coffee-Beans-vs-Ground-Coffee

I’ve found this one is fine for the Aeropress or other filter coffee if you don’t want the slight faff of hand grinder (and standing in the office kitchen getting endless comments). Quite compact so doesn’t take up much space in the kitchen / desk drawer.

Krups Burr Grinder

You need a bigger hopper if you’re filling your grinder up every time you have a coffee. Mine takes a kilo o’ beans easy.

I guess it depends on how quickly you get through it but I’d not want to leave my beans in the hopper. Mine gets emptied back into a sealed bag after use. Still pouring some in, and then back out again, takes a few seconds. Not really a hardship.