The owner is inconsiderate and does not know how to run a business. As a person, he is alright but he doesn't understand how to manage people he employs. He has no sense of responsibility and nothing is ever his fault. He will insult you and belittle you. He is very impulsive and his mind changes all the time for no logical reason. Do yourself a favor, save your soul, go work for someone else.
All work days are random. You will be asked to do all manner of things regardless of what you were hired for. You will be expected to be available 24 hours a day. Time is always of the essence and nothing you do will ever be good enough.
I sincerely wish I was exaggerating.