His PK's are kinda risky but so precise most of the time... tho I'm afraid he's gonna miss a big one some day cause of his power-based technique.
I love his kind of penalties.
I hate seeing penalties taken where the keeper basically has a 50-50 chance of saving it because he'll get to it if he guesses correctly.
I'm not even all that keen on the Balotelli style disguised/waiting for the keeper to move type penalties.
If you are a good striker of a ball, you should be able to either place the ball well enough or hit the ball hard enough that what the keeper does is an irrelevance - he has no chance of saving the penalty whatever he does.
For that reason, I'd be pretty tolerant of Vidal inevitably, sooner or later, hitting the post or the bar or putting one over the bar.
Obviously you'd hope it wouldn't be a very important penalty it happens with, though.