Carrie Hagen, Nonfiction Writer and Researcher, Teacher
I suggest asking your son/daughter's guidance counselor if you could have the name of the parent(s) of another student in the same situation who did skip a grade, or a class level, even if it isn't the same one that you are considering having your child skip. Ask that parent about the pros and cons, and perhaps ask if you or your child might speak to his/her child about the experience.
As a teacher, I also suggest that you talk to the (or a) teacher of the class your child would be moving into ... what would your child be missing if he/she made this move? What does the teacher see as beneficial? You might receive some unforeseen advice that would help you prepare for such a move.