I think the necklace is definitely worth the price. It's not a piece of 'fine jewelry' that will last for generations, but it is exactly as the picture shows and as described. As with any locket, you'll need to size a photo down in order to have it fit correctly.
There are NO traces of glue. It does feel delicate, but it's an inexpensive piece of costume jewelry. If you have the right expectations, you won't be disappointed.