I got my MagicShine from Geomangear two weeks ago. it is INSANELY BRIGHT and I can't believe it was only 2x the price of the lousy LED light I got from my LBS a year ago.

the only downside is that the battery pack is rather large/heavy. for awhile I tried wrapping it around the top tube, but it kept getting in the way. then I realized that GMG shipped an extension cord with it, so I just hang it from the back of my seat and wrap the cable around the top tube. works great!