there is a diffuser on the myo to spread the beam. For the sleepwalker I tried both and as before found that having it on spotlight mode worked better for me - you never actually look at the ground at your feet do you? the way the brain works you're instantly memorising for a second what you've just seen and then stepping right. So on a fast downhill i tend to move the beam slightly further ahead. when the mist is down and you can't see more than a few feet i focus it close.
I've not compared other head torches so maybe I'm just poorer than I could be. The alpkit is incredibly cheap for the praise it's getting. I'll have to get one just to see 
I don't know what the battery life is like - except that I didn't have fresh batteries on saturday, and it took me more than 4 hours and everything was still fine for walking the dog this evening
Edited: 26/11/2012 at 22:00