From the RealEstateJournal (update 3 Feb 2014 – the previous link broke; this one works)

Finding an agent is a lot like dating: Chemistry counts. You’ve given ample hints that you prefer No. 1, the agent with whom you have rapport.

I am not sure that my wife would agree, but this is true. If there is not the appropriate chemistry between client and Realtor, the working relationship may be more difficult. Be sure you feel comfortable with your Realtor and feel that you can trust him/her. Not all Realtors are the same!