Pros
Can use Linux as your desktop PC in the office. Will learn very quickly how not to run a business. Will learn very quickly how not to program. Will learn very quickly how not to interact with / look after clients. Will make you very happy to get any other job anywhere.
Cons
The CEO is unaware of how long jobs take and puts extreme pressure on his employees to meet unreasonable deadlines that he has already promised to clients before asking devs about time frames. The CEO is manipulative to employees under the premise that "we are a family" so that therefore makes doing thing okay that normally wouldn't be. e.g. Not paying employees on time, Getting angry when unrealistic expectations aren't met, Demanding overtime without pay because "we all have to sometimes" The management pushes employees to finish products not as per the scopes in order to save time as time frames are always scoped incorrectly. Management scopes are poorly written and thought out, this leads to poor time management, bad/incorrect code being written, security measures being skipped because "that takes to long and doesn't matter", and client expectations not being met. Biased is given towards different skill sets, knowing Linux isn't valued as security is less important to the CEO. Knowing how to quickly and poorly write code is his primary concern.