Pros
So much pressure, your next real 8-hour job will feel like part time. You become really fast at your job in order to avoid nonsense complaining and you learn to have hope for a some kind of appreciation that never comes. In a month you will manage to accomplish enough projects for your portfolio...! If you are smoker, you are lucky... smoke at your office so to avoid breaks! If you are introvert, you are lucky as well as long as you are not allowed to leave work in groups.
Cons
If you want life, then you have to cut your sleep. Be prepared to be bullied from your boss. Do not try to bring the police, he will disappear and deny everything. Some times, if you find yourself hidden in a small hot room(server room) that's because there are some of his friends outside from the tax services. There is a high chance to hate your job. if you are not smoker, be prepared to become one. If you are woman, you will never be considered as developer by your boss. If you want to quit, be sure you have arranged all of the money he owns to you from previous months. You should never consider working for that person. He is a thief with 0 humanity, 0 understanding, he could blackmail you and your family, he uses people, he is dangerous.