Migration assistant half worked

Bought a new MacBook Pro, used Migration Assistant. It stopped early and hasn't transferred over all my user data.

Am I ok to restart it and select just my user data (It didn't mention the other bits like applications, other users but I'll compare folder sizes later), and if so will it overwrite the lot or just transfer over the missing folders?

I assume there's only one way to find out... (well two, seeing as I'm asking here first before I give it a go and mess something up).