I bought one of these packs last summer, split it with my father in law... They're decent lights; sturdy and well made. I think they could withstand some serious use. Their finish is not top notch though, mine has some discolorations that look like uneven anodizing and the machining could be higher quality. Certainly better than say, a DX type of light, but not up to the same level as what's on my Jetbeams or Nitecores. Also, I'd say the 360 lumen output is at the emitter, not out the front. Don't know about modding them, never really thought about it or tried to take apart the head to see if it's possible.