Compared to the Mini 123, the Jetbeam BC10 is larger, comes with a clip, has higher output, better throw, better regulation, but short battery life on high.
EagleTac D25C2 is almost the same size as the Jetbeam even though it takes 2xCR123A, tiny bit longer and a bit thinner - has more output, longer runtimes, better throw, better accessories, stainless steel bezel, etc about $8 more