I don't remember so well how I felt (and it was only about 2 months ago!). I think I felt ok about it, but I also liked AUD the best so far. I think I used the research tab for most of the sims, so I felt I had backed up my answers pretty well. When I came out of FAR, I was almost positive I had failed (didn't get to finish the sims, didn't really know the ones I did work on, etc.), and cried for most of the night (until I discovered this website, as I mentioned somewhere else) and I am grateful that I passed that, too. Also, could be compared to FAR (I took AUD after it) AUD seemed so much easier!
So don't worry about the Sims. As you said, you never know what will be, so no use worrying about it (for now. when it gets closer to the release date I think I start to get a little nervous).
Are you studying for any other CPA exams now?