The Nitrolon is very tough; you won't damage it.

I like the G2Z over the G2 because of the better switch and it's easier to hold between my fingers.

There is a LED available for the G2Z (and others) available at BugOutGear.

I carry in my car a G2Z with the LED, and a Spares Carrier with a P61.

The mod is talked about here on CPF.

Batteries from Surefire, Battery Station , or Amondo Tech are a very good deal. They will cost you $5-7 apiece OTC.