well, I changed 7 realtors or buying the house. so may be some tips there could be useful.
1) I found Realtors of two kinds
a. who want to make money without sharing even a dime with me. They never admitted that if myself "the customer" is not there, they have no chance to make money.
b. the second one who wanted to help me with my purchase expenses with a limited fixed portion for themselves.
when I compared the monetary benefits, I found b. category better. I bought house 8 months ago and my realtor was an excellent person. He kept a fixed amount out of commission and returned every other penny as thank you amount for bringing him my business and also issued tax form 1099.
So now if I have to sell my house, I would again be looking forwrad to kind b. coz i am the one who is trying to make money on my house and i would prefer the guy who makes a fixed commission and provides me "thank you" amount with tax form 1099.
I would also love if he serves as common broker to buyer and seller and agrees to take only one side commission. This would make sure I get maximum money from the sale.
hope that helps