Should I hire my spouse to work in my home service business?

My wife works a good union job and has great benefits, and we have a young daughter and thinking about having a second child. Her skills would be great for my business as an office administrator but having the benefits for our family is great. 

Has anyone had their spouse make the jump from a comfortable, safe job to join your growing business to build a family business?

Did you find that the benefits from their job outweighed the cost of not having family insurance or a steady paycheque?