The experience really depends on why you were acquired. I was brought in as a consultant to support a Google acquisition 6 months in. It seemed like everyone had been interviewed during the acquisition process and depending on how you did, you became either a full-time employee or a consultant. Those that were consultants, were given a bonus when it was time to leave although some people were extended and some consultants were converted to full time. When it came time to leave, everyone left on good terms. However in my current industry vertical, companies are typically bought as cheap customer acquisition so most people are fired within 6 months.