I cannot believe how bright these are. I mainly use lights to get noticed rather than to light up the road bit these do both brilliantly. I've had to adjust it well downwards and use the flassjong modes less as I reckon they're just too bright!
I bought this to try and relieve my long suffering neck pain. Unfortunately it protrudes into my neck too much and is uncomfortable within the first minute. I'm sure it works well for others but it doesn't work for me.