Severance offer, what should I ask for?

My manager said the package is final, but the letter gives me time to review. I am in Birmingham, in case local advice matters. There is a non-disparagement clause. What did you ask for?

An hour with an employment lawyer cost me a small fee and made me feel much safer about signing.

Ask for the offer in writing and do not sign on the spot. A day or two to think is normal.