I ordered this headlamp in Sept and it finally arrived in Dec. The first shipment was defective (first run from Surefire?) but OpticsPlanet replaced it right away.
Headlamp runs just as advertised and as expected. Use CR123 batteries or AA. Use one or several. Headlamp is compact, lightweight, and easily fits into a small pocked on your pack or vest without battery pack. If yo have battery pack, you can store that separately if you need to take it with you backpacking.
Surefire lumens are conservative. So if it says 100 lumens on the box, that's like over 200 lumens from all other manufacturers.
Pros: Diverse battery use, compact, bright
Cons: none
This review was written in the old system and had content requirements that are different than reviews written today.