Pros
Opportunities to learn antiquated systems and software. Small shop, so there aren't too many names to learn. The CEO wanders around being smarmy. Tons of chances to practice smiling when you want to cry. Marketing buzzwords will become the bulk of your business vocabulary. Seriously though, Schreck aside, there are some worthwhile people at this company. And all of the misery and adversity does bring the team together in ways you just won't see elsewhere. Also, if you negotiate aggressively you can force them to give you a decent benefit package.
Cons
You'll be expected to work 80 hours a week for 45 hours' pay. You will be required to like it. You'll be working with outdated technology and trying to force it to do "next gen" things. You will be required to like it. You will take the blame when the technology fails to live up to whatever nonsense the sales team dreams up. You'll be required to like it. You may even be required to say thank you for it. Management will screw you out of every perk and benefit and piece of compensation that you do not fight for. You will be required to like it. You will be required to fawn over the megalomaniac CEO. You WILL be required to like it. I lasted for six years at this place. Four years later I still have a foul taste in my mouth that will not go away. Working for this company is a kind of unclean that does not wash off.