I know some people who worked for a company which got acquired a while back. The CEO walked away with over $11 million. Every single other employee's stock was worthless (common vs preferred). He could have paid them all out 5 figures and still had millions left over for himself.
When you find a solid leader who isn't a sellout, I suggest sticking with them. They are an anomaly.
It has been my experience that in the vast majority of the cases, the VCs and the acquirers behave honorably, and do the right thing.
This is due to several factors: 1. They are ethical and/or more concerned about their reputation, esp. for future transactions. 2. The decision makers do not personally gain from such poor behavior (the $ flow to the organization, not to them). 3. The decision makers on the acquiring side are concerned about making enemies with others from the acquired companies.