When you’re talking about Instant Honesty, it’s more like they had a shot of truth serum (sodium pentathol)
The “few beer”, or rather, champagne like effect, is more the more result of heavy alpha-nol (Instant Openness, etc.).
Might be nice for a second or third date, cheating spouse, siblings, interrogating roomates, special ops – all those things and more. 
It’s kind of eery how it works. I’m still surprised by it to this day.
It’s also fascinating that several pheromonal molecules from nature produce these kids of results. I’ve got to wonder who, in history, has wieled this power naturally.
I actually use Instant Honesty every time I buy something during a consultative sales process. Within minutes of exposure the sales person is on MY side, telling me all kinds of things they shouldn’t.
I don’t play poker, but I’d LOVE to see what would happen in that context.