And yet I have the PT-04's and have no trouble with them using both the 580EXII and a moded Metz 45 CT-1
I would guess that I get 98-99 % firing accuracy on both flashes, the one time I was having trouble I changed the frequency and that solved that problem, I was at Mt Archer here in Rocky that has TV and Radio and Telstra towers so there is a lot of RF interferance, it even played havoc with the remote for my car door locks