The Rockn' Roller Coaster?

Hi, I have been to Disney World many times... Along with the Tower of Terror the Rockn' Roller Coaster is always one ride I am reluctant to go on. I was wondering if the upside down parts feel like what you go through when you are going backwards in Expedition Everest... I am also worried about the 0-60 in two seconds. Does it have a snap your neck sort of feelings? Thanks to all who can answer.