If they are PIBA members, like myself, then that means they have access to any bank that has a broker channel, i.e. some banks don't have broker channels.
Be wary though as some banks offer dual pricing and whatever broker you choose should explain this to you. It basically means that broker customers get charged slightly higher interest rates than direct customers. Either way its worth using a broker, providing they know what they are doing of course, unless of course there is a significant difference in the interest rate he/she can get you compared to whats being offered by going direct.
Also be sure to ask if there is a fee involved!
Don't forget if you're a first time buyer you can still get 92%.