I have a number of SureFires. I like the Aviator A2 (one of their best concepts), the Z-2 is a good one, also, and the 9P. My 870's fore end has a modified 6P of some sort.
Since my Bladetech mag pouches were made for the 6P I carry it and it works as well as it ever did. One with standard bulb, the other with the Zenon and Crennelated strike bezel. One aluminum body, and one polymer.
Zenon bulb more expensive, battery life much longer.
123 batteries? Not a problem, I just order them from SureFire by the box. 12 for $21 doesn't break the bank.
You can buy a 72 pack for $126, and as mentioned the Zenon has much better battery. Surefire also has good customer service. They sent me a new bulb assembly nc on my word that it burned out prematurely.
I agree that we can sometimes get carried away worrying about all them there lumens.
The 6P has stopped people in their tracks who approached me when walking after dark. Also great for crosswalks at night. SureFire's site even has a story about a guy who used his strike bezel to save himself on ice.
Was just looking at their site like a kid in a candy store. They keep developing more and more models all the time--and my 6P still works jus fine--oops, said that already.