Plus if you are frocked early, you just become cannon fodder for the senior Hinges......don't do it.
-ea6bflyr
A frocked O-4 gets an O-3 "Selected" FITREP, therefore he/she is not ranked against O-4's.
To answer the original question, the only possible hazzard to being frocked is a higher level of expectation from others now that you are wearing the new rank. Otherwise, it's a good thing.