Sam, if you were an important (but non founder) employee at a startup and you were to be acquired, how would you approach the process of integrating and insurin

Sam, if you were an important (but non founder) employee at a startup and you were to be acquired, how would you approach the process of integrating and insuring success between the companies? and how would you evaluate the acquiring company and decide if its worth staying at for the long-haul, just until some stay-period is over, or even staying at all?