I look forward to this! The PT Apex Pro was a strong contender for my first headlamp... it is still a strong contender for my second, or third...
I just got my Saint this weekend and I've been playing with it... so far, very impressed. Beam quality and tint is excellent and very neutral, with a minor ghost of the die only showing up on white walls. No corona to speak of. The dial is perfect, incredibly nice to use, and the Saint is comfortable to wear, even with the battery pack. I can't ask for any more out of this headlamp.
I can't see buying a Zebralight when the Saint has a better, more collimated beam, a far superior UI, a more robust build and Surefire's rock solid reliability.