I use the Firefly on my ankles. It is hard for me to turn on and off, but very bright and the batteries are lasting quite well. I'm thinking of also outfitting my arms for turn signals.

I also have equipped my wheels with Lightweights Reflectors. But one thing I've noticed now that I'm riding regularly in the dark is how reflective material is not that good from a distance. Walkers and bikes with bright lights can be seen 1/4 mile or more down the road, but reflective only people not until I'm nearly upon them.