Any american-based VPN company should be assumed to be a honeypot—use it to dodge your ISP, not governments.
An additional use, and the one I use VPNs for from time to time, is to throw off ad-network information and avoid over-disclosing information about myself.
If the government wants to snoop on you, a VPN is one NSL away from having full access to all future use unless you hide your identity and money trail very carefully.
But given Snowden's work, we'd be foolish to assume the collaboration is limited to this fact.