Medicare Advantage plans now cover slightly more than half of American seniors in the Medicare program. The attraction is in both the low costs and the additional services they advertise. But there can be significant drawbacks to Advantage plans since they limit covered access to physicians and hospitals in their network. It’s up to you to become informed about the balance between additional benefits and the limitations that Advantage plans might present in the future if you need extensive medical care. So here are a few things to consider in making the choice between traditional Medicare, with a supplement and a Part D drug program, and Medicare Advantage.