Just finished the review. I think I'll wait for the 2W version and also see a battery run on the 1W first. I too was thinking the voltage boost for the CREE XRE LED on the 1W. Last thing I want is the light to cut out on me while riding. Cree needs 3.5v to power. 2xAA = 3.0.
I purchased their half-watt about two weeks ago and noticed that the 1 and 2 watt models are now on their website, expected to ship in May or so. Only having done one ride where I used a completely unlit path, I can see the need for something with a lot more light if I start doing that on any sort of regular basis. I'm otherwise happy with my 0.5 watt model so far and will probably go straight to the 2 watt model to make it worth the upgrade when the time comes.