Broadly speaking, the Time-Conveyor was a fully functional time machine. Indeed, it was functional enough to have been officially "launched" during a press conference on Earth. Still, it did have some known bugs. Navigation to precise moments in time was not assured, nor would it always return home reliably. Even so, the Mark One's unreliability wasn't as profound as might have been expected. The inventor took a number of reporters forward in time six months, then brought them back to the product launch without requiring the Mark Two. (PROSE: Timechase)