One of the problems with landing a reusable rocket stage is...what if it goes wrong?
Elon Musk's answer to it is to land the rocket stages at sea...but we're not talking ditching. Instead, the rocket will be landed on an autonomous drone, based off of some aspects of an oil rig. That doesn't, of course, give much space for the rocket to land on, but the SpaceX team seem convinced they can pull this off, partly with the help of grid fins that deploy during the descent.
What do you thing - is this getting into overcomplicated territory or is it going to be just plain awesome? (Well, it's awesome. If it works).