No claims, thankfully. Insurance was very cheap. I believe just under $300 on a $30,000 addition to policy. Policy is the Fireman's Fund package offered through ASMP. The agent is Taylor and Taylor. To buy the package you need to be an ASMP member, which costs around $250 per year. The overall package was around $1,300 before I added the new equipment.
I am not impressed with Taylor and Taylor. They "talk fast" and ignore the specifics of your question. They promised me an answer about a question I had in two days. A month later, nothing. I will be following up with Fireman's Fund directly.
I had every thing on my Chubb homeowner's policy, but when I started selling, I needed pro insurance. Chubb has a great claim reputation, so if you can find a business package with Chubb, I would look at it closely. I haven't found one yet.
It is cost effective premium wise going with professional association packages. Putting the coverage together on your own will be more expensive because insurance companies charge a hassle factor when they work with just one person.