I'll be the contrarian and suggest a Streamlight Propoly 4AA Lux. It's a classic light, couldn't be simpler to use, and is less expensive than all the Fenix's mentioned. I also think the PP is more comfortable to hold than an in-line 2xAA light. And while not nearly as bright/efficient as the Fenix Crees, the PP4AA Lux stomps the L2DCE in runtime if the user will only use the Fenix in Turbo mode. The PP4AA Lux also runs much better on Alkaline AA's than the Fenix's in Turbo mode.
I've got about 4 Fenix's but wouldn't give one to a non-techie. If it's a clickie Fenix Cree, what mode do you leave it in (Turbo/Strobe I'm guessing since a single click gets bright light as expected)? If they bump the switch and it changes brightness or into a flashing mode, will they remember how to tap the button to toggle back to the first mode? If the head accidentally gets turned, are they gonna know why the light is so dim (came on in low mode)? If left in one mode and they learn mode changes for that mode, when the head gets accidentally twisted, will they then be confused because there's more or less modes to cycle through?
Keep it simple - Streamlight Propoly 4AA Lux.