The jack itself works fine but the design is terrible. I plug my headphones into the jack and literally only about half of the connector from the headphones pushes in. It's enough for the jack to work and the sound to come through but as one of the other reviews mentioned, you have to be careful as it doesn't exactly fit snug.
... I've came back to update this review. I've taken it from 2 stars to 4. I found after (a lot) of force, the headphones did in fact connect all the way into the jack so you could argue the other way that it actually fits VERY snugly! Just don't be afraid to use excessive force... and don't blame me if you snap anything... :)