If it ever warms up and melts the ice around here, I'll give my review of my new dynamo light vs. the battery lights I've been using until now. One is similar to cehowardGS, the other is a Lezyne Super Drive. One thing I'll say for certain, the two different battery lights are all metal, the B&M Cyo is plastic but still cost a lot more money. Plastic is lighter, but I think the metal lights will take a beating that would destroy my B&M. I won't comment on the beam because I haven't done a side by side yet. I have all of 10 minutes use of the Cyo so far and it wasn't completely dark.