Ventajas
Quiet, efficient workplace with real options to grow within the company. For couple months whilst I worked there it was a great experience. Had to resign due to personal reasons and moving to a different city, but it was fun. Non-invasive, get in, do your job, leave. Also if you're lucky you'd get assigned to a cool project and work on an interesting title. Great starting point for people interested in game development. Gives lots of insights into higher structures. Company also offers a lot of training materials, lots and lots of guides and interesting development-related instructions.
Desventajas
Unfortunately, I'm going to point at the paycheck. For the qualifications needed and work you are required to do you are offered minimum wage, which is not nice.