Hi there we received our 189 visa grant letter today (myself, husband and 2 kids) My timeline was application lodged 27/06/14, case officer 11/9/14, medicals and pcc 22/9/14 and grant 22/10/14. We used an agent too and waited to do medicals/pcc as requested which does slow it down a little. There was a longer wait with the June applications (due to backlog on Australian side) than normal but hopefully you will be a little quicker. Hope this helps and good luck x