Yes this one's a doozie, potentially more pokey than the much maligned Skybolt. Mind you it's kinda obvious if you read the physical description, so using it for Oratory to take your example, the audience could well look at the glowy lines coming out of the caster and think hmmm... :lol:
For the same reason I can't help but thinking it's a bit of a liability for stealth & sleight.
It depends on the GM of course, but even in a Magic-Rich campaign nobody is going to be pleased with anybody obviously using magic to manipulate them. In my games I class it as Common Assault, and the authorities / community take an exceedingly dim view of public magic use outside of temples/religious rites. (Even then it's obviously only okay for Cults they support/approve of, people are sooooo judgemental!)