Does it come with bags?

It depends on the variant. Some listings include one roll of bags and others are the dispenser only, so check the option you pick before ordering.

Will standard refill rolls fit?

It takes standard roll-style waste bags. Very large or wide rolls may not fit the housing, so measure the roll before refilling.

How bright is the light?

It is a small LED meant to light the ground near your hand, not a path-finding beam. It helps you see where you are picking up but will not replace a flashlight.

How do I attach it to a leash?

Most versions hang from a loop or strap on the housing. Confirm the attachment type on the variant you choose if you plan to clip it to a belt.

Are the bags leak-proof?

The included bags are described as thicker and leak-proof, and owners generally find them adequate. Thin third-party refills will perform worse.

Is it worth it over a plain bag holder?

If you walk your dog after dark, the light is a real convenience a plain holder lacks. If you only walk in daylight, a simple holder does the same job for less.