How much protection do I need for my Droid Ultra?

The device is thinner and more durable than earlier devices thanks to new, unibody Kevlar construction. You can get something with a little or a lot of protection, ranging from an ultra-thin shield to a dual-layer hybrid with a hard case and soft rubber-silicone skin.

Should I have something to protect the screen?

Not necessarily, but you have options. Some cases have a built-in screen protector or you can protect the screen with a thin layer that features precision cutouts for the home button, camera, sensors and other features.

If a case has been refurbished, does that mean it was used?

With cases, it could mean the box was opened but the product itself was never used. Refurbished products are normally tested for functionality and defects before they are resold.