The issue is that cables from PW are so expensive. 10-pin remote shutter cable b/w Nikon camera to PW3, TT5 costs over $100. FlashZebra offers very reliable great deal in my experience.
When I was experimenting, I found out that my old 10 pin remote shutter cable from FlashZebra (I used for D700 and PW2) is not compatible to TT5 and PW3. Then I ordered a proper one for TT5 / PW3 while the old cable is in ebay.