I'm curious about the relatively dramatic difference in runtime with the UWAJ.
Haven't seen such a difference between different Vf emitters before, and it has me wondering how that will affect mine if I drop a UXOK in there. Also about how low the Vf is on the stock emitters(haven't had mine apart to check), especially since I'm using rechargeables with the stock light now, and would prefer not to fry it putting it in direct drive with them, since the emitter swap is still a "maybe".
.02 on my P1:
My P1 started out being used to burn up old 123s, and being carried in conjunction with my EDC Aleph2. Right now the P1 is pretty much all I'm using, and is getting fed with R123s. From day one, it's been carried in the same pocket with my keys, and has been dropped a few times-not a mark on it, literally looks brand new. It loses out in comparison with my Aleph2 with BB750/TYOK with both on R123s, as the A2 has both brighter spot and spill. Spot is about the same size for both lights. The P1 is bright enough that I think the only thing really missing from a practical standpoint is the low beam, though. Color-wise, my P1 is definitely a YO, which is ok with me, but I'd prefer a XO or WO for what I use this light for.
I have no quality complaints. Threads are fine, finish is great, beam is great, runtime great. I like the fact I've got a split ring and lanyard on there, but can still use the light in "candle" mode, which I can't do with my Aleph. There was a little battery rattle, but a foam corn pad eliminated that.
I loved and for a time EDC'd an Arc LS with twisty, but like the P1 more, since it's better in almost every way.