"For a modern / current taillight with a reflector, what about the Portland Designs Radbot 1000?"

I am kind of a stickler on this point about "reflector". I don't own a Portland Design Dadbot but I might just go out and get one and test the "reflective" part of the light.

It appears clearly this design does have more of a REAL reflector than the Super Flash that has some fancy diamond molding that provide NO reflective capabilities.