The 8NX is a tough, durable flashlight. SureFire is waiting for new B90 Batteries to arrive. I will be buying two 8NX-YL myself and a friend when the reliability of the B90's is back to normal. This could be sometime until SureFire have enough new B90's to correct for the bad batteries which were released.
Cons of the 8NX in my experience of field-testing one are it's Lexan lens and no LockOut.
Pros of the 8NX are two batteries, rapid charger, KT5 TurboHead option, Lanyard option, BeamFilter options, Holster options, tough, resiliant Nitrolon. Bright pure output for a very stable X80 lamp, and general abuse resistant package.
In the future, we are likely to see a 5 Watt Luxeon Bezel for it.
Al