This was my experience:
Testlet 1-AWESOME!!
Testlet 2-Couldn't answer a single question with confidence, some I couldn't even narrow down
Testlet 3-Okay, the difficulty had obviously decreased since I did so poorly on the second
Sims-Okay, definitely got the research, the others I wasn't confident on but none were tax related which I feel is my strong suit
After testlet 2, I honestly couldn't tell if I was doing alright or if everything just seemed so much better in comparison. I can tell you I was confident I didn't pass or would have been right on the borderline. I am shocked with an 83 so I would tell everyone to be hopeful for a curve!!
I hope that helps! I know I like to hear about other people's experiences but I know I tend to ramble… 🙂