Severance agreement arrived, need a second opinion - 21 weeks in

The company sent a severance agreement with a release of claims, and I am unsure what to do. I do not usually post, so bear with me. I do not want to leave money on the table.

I asked for two more weeks and a neutral reference. They agreed to the reference and added a week.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.