Medicare Part D Covering Common Medications at Low Co-payments (Kansas City InfoZine)
An examination of Medicare Part D plans in California and Hawaii reveals wide variations in drug formularies, but indicates that for many classes of drugs, it is possible to find at least one or more drug that is covered by nearly all Part D plans.

General Satisfaction With Plan Benefits Found Among Patients Navigating Medicare Part D, According to Study By GfK ... (RedNova)
Patients participating in Medicare Part D prescription drug coverage are, in general, satisfied with their current plan benefits.