I just wanted to bump this... These are awesome lights for this price, even considering the high shipping/handling charge. The #4 power Eiger is an ARC AAA killer, and the #8 is a powerhouse, especially on 10440 or 2xAAA.
I keep the #4, medium, lugged around my neck at all times--it will run for ~5 hours on an Eneloop, and the floody beam makes for the best headlamp I've used when clipped to the brim of a hat. I no longer use my Zebralight H50 when the Eiger is handy. The #4 seems more than twice as bright as my ARC-P snow.