Is 47 inches tall enough for a full-length view?

For most adults around 5'6" and under, yes. Taller users will likely see themselves only from the knees or chest up, so measure your door and your height first.

Can I use it without hanging it on a door?

Yes. It also mounts on a wall or stands on its own, so it works in rooms without a suitable door.

The mirror is 14 inches wide and 47 inches tall, so it fits standard interior doors with room to spare. Check the over-door bracket thickness against your door's top edge.

The mirror and the over-door hanging hardware. Wall-mount screws are not always included, so check before planning a wall install.

Is it worth it compared to a leaning mirror?

If you rent or want no drilling, the over-door option is the main draw. A wider leaning mirror gives a fuller view but takes floor space and needs a wall to lean on.