How visible are they from the rear, given that half your foot is behind the pedal and presumably obscures the reflectors?
I don’t really give a toss about how visible they are. I have a selection of massive lights, reflective bits on my clothing, high-viz and whatnot to deal with that. I fitted legal reflectors so that, in the event that some tit does run me over and kill me, there’s less chance of the useless bastards that comprise our so-called justice system making a finding of contributory negligence and thereby reducing either the sentence for the driver or the payout from the insurance.
This is the same reason why you should always wear a helmet: a foam hat ain’t going to stop some shitbag in a 40 ton truck from killing you, but if it does happen at least your family will hopefully get as much cash as possible to keep food on the table after you’ve gone.