I received mine on Saturday. My first concern was the heat. After checking Salesinretech's comments, and finding it's direct drive on two AA cells, I wasn't as concerned. It's a direct replacement of the lamp, with you just plugging it into the two holes the lamp occupied. The optics had a tendency to spin against the lens when you twist the head turning it on, which I knew would end up scratching eventually. I transferred it to a Legend AA that I didn't use much in order to make use of the tailswitch, and sealed the head in place.
As Roy says, it's a good white even light, and next to the Reactor, it's a limousine. I suspect it will dim rapidly, but it does a good job on fresh batteries.