The downsides are:
In my experience, a lot of people simply do not check things very carefully, including the track lists that they give. This means that I'm often asked to make a new master after I've made the master, 'cause they made a mistake with titles. When I say there's gonna be an extra charge, people sometimes complain
.
So, the way I deal with this is to always ask for a "final confirmation for the CD text info" of the tracklist / cd title / artist name just before i make the master, regardless of whether they gave me the info already - this seems to help focus minds and reduce problems of the above nature.
Good luck!