Woow. This looks amazing. However "possible" pro and cons are as follows:
Pro:
• Would reduce high risk of accident from drunk fellows.
• Guess who's bank account just shook? The uber driver.
• Reduce high intake of alchol so user drives home himself.
Cons:
• Prone to misplacing due to size.
That notwithstanding, it looks like a pretty cool innovation.
P.S: Possible pros and cons cause i have not used this, so they are just speculation.
Cheers @xpressng