LISTER: Oooh, I can't wait to see your face in the morning, I really can't.
RIMMER: And nor I yours, Lister, when that pod opens and from it emerges a beautiful alien woman with long green hair and six breasts.
LISTER: Six breasts? Imagine making love to a woman with six breasts!
RIMMER: Imagine making love to a woman!
Normally the first stage of a rocket is just discarded into the atmosphere and it burns up. It's a huge wasted expense. Landing it saves a ton of money and will make launching things into space a lot cheaper.
If you believe Musk's crazy plan to send people to Mars, a manned version of this would give them a way to land and take off again, too.