Finally picked up the RedEye Micro today. Wow!!! Seriously bright light, I did about 10 miles with the Joystick and Micro in a headstrap (rather than the helmet mount) and it's flipping good, if such things can be measured by the room I was given by overtaking cars.
And, when I say seriously bright, that's just seriously bright. There's no "for something so small" proviso on there. I've just tried it against the Smart 1/2W rear and it looks (I didn't take my light meter to check it!) brighter by a factor of 3 than the Smart.
Fantastic, it makes the Joystick the head light to choose, IMO.