I went for just the normal handlebar kit and the light casing is blue because it was the only colour they had at the time
I certainly dont regret buying them I go out on a 15 mile ride round the perimeter of my town every night I get the chance, it is a mixture of rough off road cycle path with no lighting at all, dark backroads and main roads, not a problem at all for me at anytime of the year.
Also they do get you noticed on the road at night but mostly I got them so I can see where I am going on country lanes and off road trail/bike paths, I once got caught out coming over the moors when it got dark and I couldnt see a thing
. I also have a 9 LED Electron front light I use in flashing mode when in traffic and a backup cheapo front light and 3 back lights.
The battery only needs charging around once a week and the lights can fit in my pocket if I need to go into a shop as they weigh next to nothing and dont get hot unlike the halogen ones.