Lets get one thing straight, this is not a replica of the doctors sonic screwdriver. The doctors sonic, is not an actual screwdriver. This is a novelty, working screwdriver, that has been made to resemble the Doctors sonic screwdriver.
As previous reviews have said, the main part of the body is metal, and the top part is plastic. The screwdriver pieces are stored inside the screwdriver to keep everything tidy. There is a button on the main body that activates light and sound. The sound, while not perfect, is OK, and the light is very good, slightly brighter than the toy version. The screwdriver itself is quite heavy and feels very robust.
If you're after a sonic screwdriver to use as part of a costume, then go for the toy version, due to the added spring loaded effect, but bear in mind that it lacks the durability of this one. If you are looking for a novelty screwdriver, then this is a great little gadget.