tofu

i think before you choose your friend as your agent, you need to know what is his style, and how well is he doing his job.
I used a friend as real estate agent, he is so green, but that is why he can spend so much time on my case.  the deal didn't go though but i am happy with his service.  i chose him  because i know he is a honest and responsibility person.  
the experienced one usually is really busy, he may not have time to address all your concern, or sometimes you just deal with his assistants.