Some benefits are limited. If you drop it, you can add it again at an open enrollment but must stay 2 years. May be important in some circumstances. You must pass health scrutiny, but it is not too difficult to get. Your employee insurance ends at retirement.
Premiums are high for the conversion.
You will need to take documents such as birth certificates, marriage certificates, etc., with you. Signing up for Medicare Part A is free sign-up at age 65. You must sign up for both A and B to be eligible for the Health Care Authority medical plans. Sign up for Part B at age 65 unless you continue to work. In that case sign up when you retire.