After a week of daily commuting use I must say the Flux has exceeded all expectations.

I find it very convenient and useful that one may access both power level high and low beams with one button push without having to cycle through them. The high power high beam at 1200 lumens is pretty much overkill for my needs, like a cars high beam its too much to use in the presence of others, and more than is needed elsewhere.
The high power low beam addresses my commutes trouble spot, a 3/4 mile decent down a 12% winding 2 lane arterial that's just outside the city limits, and sees little maintenance. Under most conditions the Luxos is sufficient, but in the wet the glare off the wet pavement from oncoming cars would wash it out, making debris hard to see at speed.
The low power high beam on the rolling, winding MUT that follows allows me to pick up the pace a bit, and on the rare occasion I encounter someone else, the handlebar switch allows me to dip the beam instantly.

The low power flash function seems to be just right for daytime use, its not obnoxious and overpowering like the strobe on my Cygolite or Cateye. The modulating function is usable on both power levels in the dark like the Cygolites steady flash, perhaps even more so, but I still prefer to not use it after dark.

Since the Flux will function with an external power source, I purchased a 15600mAh usb powerpack, which in theory extends the run time from the claimed 1.45 to 6 hours on the internal battery, to 6.9 to 20.8 hours on steady, and up to 80 hours on flash.

If I had to choose between the Flux and the Luxos I would still choose dyno power over battery, but fortunately I don't have to make that choice. As far as battery lights go, its a light in a league all of its own since Phillips no longer makes the Activeride light. IMO it makes all other battery lights obsolete, a total game changer, and a real shame its price will limit its appeal.