As said by AditiM1984, I also felt the same. I took exam on 2nd October 2014. On 13th day I got mail from IDP saying that, they can publish the results only on 27th October 2014.
I was very confident that I did well in Reading, listening and speaking. But for writing I know I will get less marks. But on seeing the results, I was shocked, because Reading, writing and listening I got only 5.5 and for speaking I got only 6.5, which is very less.
I read few of the forums saying IDP results are not genuine, they wanted-ly reducing the band scores, so that you will reapply for the test. I will not recommend IDP for IELTS exam.