I used the Blaze 1 watt for the first time last night. Seems reasonably bright with a blue hue, illuminates signs and other reflective materials well, but I don't know how well it would do in really dark conditions. The roads I ride are well lighted for the most part. I might try a flashlight set up in the future if I end up needing more light.

I don't know if there's any reason not to, but if you buy the combo set you could always mount the SuperFlash to the front and leave it on constant or use both on the back, one on constant and the other on flash. Planet Bike's website has pictures of the beams for all their lights, if you haven't already seen 'em.