I bought an Ay Up Ultralight last year. 400 lumens and its been amazing. Lights up your path and then some.Its never let me down and even in mist its performed well. Same weight (ish) as a Myo XP but way more powerful. 3 hours on full power and 6 on reduced. Easy to put together, charge and use. If you have the money and you will use it I have no probs in recommending it. Alas since Feb 2011 they get shipped from Australia! so not sure how long it will take to get it.
1000 lumens!! Be careful when you are out with others or you might melt their retina!