I didn't trust the $42 one, so ordered the 1000 lumen 3 mode for $72 delivered. It took a while to arrive - about 3 weeks, but when it did arrive I was happy with the way it was packed and visually it looked quite sturdy, although time will tell on that front.
It certainly is bright. Way bright enough for any night riding I will be doing. And the flash mode is just right for being seen during the day, particularly on busy roads with a lot of side streets i:e Maroondah Hwy through Mitcham/Nunawading/Blackburn. The strobe on the Fenix I used previously was way too fast.
Another great feature is the battery indicator light within the switch - seems to be accurate so far. Green is 100-75%, Blue 75-50%, Orange 50-25%, Red less than 25%, flashing red on imminent shutdown.
Ayups were simply out of my price range and this looked like a suitable alternative. I know of another forumer who uses one on the RRR and his always seemed to stand out from the bunch as you watched them approaching.
As for the whiffletree, I built my own using only a paperclip and some ingenuity