Zecto Drive Pro arrived today. Will report back if I can test over the weekend.
Bit late for this thread, but I used the Zecto Drive Pro over the weekend. They can be used as front or back. So did just that. One on front & back. They seemed pretty bright in dull misty weather. Noticed some road signs picking up the flash about half a mile away.
My only concern is in low light I couldn't tell the difference between bright & normal flashing. Can affect the battery life. In the dark I'm sure it's obvious.
I ran them both on a long ride for about 6 hours. Front run out of juice just before the back. They went onto solid light before dying.
Fuel gauge is very useful, but not that visible when cycling. Alternatively Mr.Black skull novelty light kept disco-ing all day long.