Yes, twice I have used a broker. Both times very happy. Just remember, that a broker charges a fee. Somebody has to pay that fee
Are you salary sacrificing? The salary sacrificing company will broker a deal but you are not obliged to use their broker.
Are you a member of a trade union? Is that union a member of Union Shopper. They have a brokerage arm which I have used.
Are you a member of RACQ? They have a car buying service.
Are you a member of a credit union? Some have a car buyimg service.
Good luck
KB