I worked at a company that was acquired earlier this year and I didn't care for the new employment contract. Unfortunately, the sale was contingent on a certain percentage of the team signing the new employment contract. I had a lawyer look at the whole thing and he told me that because of the way the deal was worded I could sign and quit without affecting things.

I looked at the contracts a ton myself and basically made no sense of it. The lawyer spent a couple hours and it was a big help.