I have both a 8AX and 8NX and find the 8NX to be a better incand.
Its Nitrolon so it is lighter (not great if you need to use it as a weapon)
Doesn't get as hot to hold (could be a con in cold weather, but then the Aluminum is cold as ice when not in use)
And the lens is Lexan so if dropped it won't crack like the glass in the 8AX(but if a lens cracks Surefire will send a whole replacement bezel)
I upgraded my 8AX to LED with my custom modification and the metal body is needed to dissipate the LEDs heat.
But I keep a 8NX in my locker with the X80 Bulb.
Unfortunately this is an off size Lamp Assembly and no one makes a good upgrade.
But I also assure you the beam is much better than a Stinger and brighter.
I believe it is brighter due to smooth beam where as the stinger is more like a maglight with artifacts.
Batteries can be upgraded to Hi Capacity NiMH.
The SF charger I have can be made to charge NiMH, I just installed a switch on the PCB so I can go from NiCd to NiMH.
Sorry I didn't get a picture of the switch. Just change the jumper wire on SW1 to Center and Left to make it a NiMH Charger Only.
I rebuilt the NiCd B90 (1800mAh) Batteries into 4500mAh NiMH Sticks.
I carry a spare charged battery and can change it in the field.
The ability to swap the battery outweighs the convenience of the Stingers wall charger.
Like others said you loose the whole light while the Stinger is recharging.
Good luck on your search and feel free to ask any questions,
Welcome to CandlePowerForums
Brian