Pros
You will learn how NOT to treat people through witnessing and experiencing the emotional, reactionary, immature, inconsistent and aggressive behaviours emanating from the owner and his 2 main direct reports. Working environments should not be like this, however you can learn never to behave in the way they behave.
Cons
Long hours, zero autonomy, zero trust, manipulation of details to ensure owner keeps as much money and power as he can and the products just taste appalling making it a lot harder to sell. Unwillingness to learn from mistakes and learn how to behave in an acceptable and ethical manner lead to a hostile environment where people are treated very poorly, praise is non existent and there are no perks. Having sushi twice a year does not count as a perk.