If I could give zero, I would. Express Scripts is the most difficult pharmacy plan ever. If you have specialty drugs they make it extremely difficult to fill. They question the doctors repeatedly for the diagnosis they have been repeatedly given. They question it every time delaying life sustaining medications. These medications are not free. We pay large sums for the medication. Their customer service is rude, unhelpful and unknowledgable of their own rx's and your coverage. It is a shame employer force you to take Express Scripts. They are a monopoly company that needs to be monitored. They are owned/a part of CIGNA.