A very quick way to get clean bevels on your lowpoly geo without having to go into Zbrush and Polish/get meshes ready for zbrush etc.
I'm using Zen BBQ to make the bevels, Zen BBQ is a plugin that will quickly let you make and preview the bevels in near-realtime.
I am selecting an sharp edge, then going to Select > Select Similar > Sharpness to select all edges of the same sharpness. Then applying a Bevel through the Zen BBQ radial menu.