I readily concede that bike mirrors arent fantastic, but on a narrow bit of road with lots of coinciding front and back trucks, and or Mr and Mrs Smith in the rented motorhome with the leg chopping off steps sticking outta the side.....hell, I will take a second or two's worth of blurry info over nothing.

but your mileage may vary.

ps, the dreaded 10 or 20 or 30 klicks more than expected to the campsite...arrgh indeed.