Hi Michael
I have an AP, and I promise you wont be disappointed.
I notice some items have been mentioned already, but here are a couple of things you will need to replace, so will list them below.
Hovi mic tips....AP comes with tap aerators.
Suggestion, CFO (cast from original) send a PM to Sskunky here on the boards, his are awesome, complete and ready to install.
"S" trim for bottom of helmet. AP come with a "U" shaped trim, fine for basic approval, but if you are considering the higher levels of accuracy (EIB and Centurion) S trim is required.
Suggestion Trooperbay sells S Trim
Which TK are you building?? ANH,Stunt or Hero, ESB or RotJ.
This info will allow me and others to give better feedback, aside from that, keep researching and good luck with your build.