Doesn't seem to matter how much light I'm buzzing out the front. Within the last week I've nearly been taken out twice head on. One berk just pulled across to park on the wrong side of the road in front of me and one decided not to give way at a chicane (full of potholes and a speed bump that needs to be negotiated) and I managed to just clip her with a pedal taking evasive action. She said that she didn't see me. That's until I turned the handlebars sideways towards her through the window. She saw the 2 LEDs then.
From what I can see you're always going to get problems no matter what you are wearing or reflecting out. If people aren't concentrating they are going to cause problems somewhere along the way. Usually at the end of a working day.
As for big rear lights, I've got a pretty big red LED (Blackburn Mars 4) on the back but nothing like the Hope thing. Must only be for following a mate offroad.