Are Antros in Puerto Vallarta Legitimate and What's the Cost for a Night Out?

Be cautious of any deals that seem too good to be true. I've seen a few ads for antros that offer 4-hour splits between two clubs with open bar and unlimited service of domestic alcohol, beer, and bottles for around 90 USD. That sounds like a lot of value, but I'd want to know more about the clubs and the service before signing up.