On: SpaceX Will Launch Its First Reused Rocket Later This Month

[TorKlingberg]

Solid fuel rockets have a much simpler design, no fuel pumps or cry-cooled fuel tanks. But they are less efficient weight wise, and you cannot turn them off to abort a launch.

[simonh → TorKlingberg]

Unless you decide to compromise the design by manufacturing them in sections with dodgy O-ring connections.