The Nao is a MUCH better lamp, yes its more expensive but IMO totally worth it. At max power it throws a huge amount of light, at lower levels (but still brighter than the Tikka) it has a long burn time. It auto-adjusts to ambient light levels, run down a street with lights and it dims right down and saves the battery, come into a dark forest and it ramps the power back up, look at a map/signpost/person and it dims again. You can connect it to a PC/MAC and custom tune the light levels in various modes.
For me it was worth every penny. As trail runner nation said when they renewed it, ok it's expensive but what price do you put on being able to run through the dark in safety, what price on a broken wrist if you trip over a tree root or rock?