Insurance Broker

I am trying to evaluate our current employee benefits insurance broker and am also meeting with about 3 other vendors to possibly transfer our business over to them. What are some things that you look for and/or want in your insurance broker?
Comments
--Average client size (Do they often work with groups similar to mine demographically?)
--Market penetration (Do they have a lot of groups? This can help when haggling with the carriers.)
--"Extras" (Will they help you complete your Form 5500? Will they act as an employee advocate if there's a dispute with a carrier?)
--Contact (How many times a week/month do they speak with their clients?)
--What carriers do they have good relationships with? Do they have a personal contact at each carrier?
Hope this short list helps, and good luck with your selection!