Are the SPs nice?

Some examinees said the SPs are very nice and friendly, and they went through the exam in a good mood. Unfortunately they failed the USMLE CS. Others said some SPs are tough and asked them to repeat the question they've asked, but they passed. The SPs are very experienced and well-trained. It is their job to deal with crowds of examinees day after day. I guess they have a clear impression that you will fail or pass after they talk to you and evaluate you. Therefore they may give you some tough time when they think you are good; and maybe very friendly when they feel you are not that great. So, do not be dominated by SPs. Do what you should do, say what you should say.