I'm with Slick.
The NX-01 concentrates the light fairly evenly in a decent size spot (not huge) that's great for a task light, perfect for reading. The NX-05 tries to emulate a typical flashlight, with a tight hot spot and a large corona. It's a fine idea, but for that kind of beam pattern, I feel you need a lot more power behind it than a 1W LED. Having a hot spot for throw and a large corona is just too ambitious for a 1W, I find; it ends up failing both in the hotspot/throw and in the spill light. I think the NX-05 will be really nice on a 5W, or even on some of the more insanely overdriven 1W's, I haven't tried that yet, but on ~1W I definitely find the NX-01's more useful. I have NX-01's on my MADMAXes, KL1, and if I can get the damn thing apart, I'll have one in my LSH.