Year round school basically consists of 9 weeks in school and then 3 "tracked out"--all year long. Of the four tracks, one is always "tracked out" in the rotation. For example, Track 4 starts back tomorrow, after being off for three weeks. Track 3 now begins their three week break.
I can't speak for surrounding counties, but the benefit package from Wake is not as strong as where we came from (obviously it wasn't a deal-breaker-we were looking for better quality of life).
Year round school works for us--but that opinion isn't shared by everyone. Not until we moved here did we realize that YR school was a "hot topic."
As for changing classrooms--that may or may not happen to you. It depends on how crowded the school is--besides, it keeps you organized :-)
Check out
Wake County Public School System and good luck in your decision :-)