I have this light, and do NOT like it. Firstways, the LED is the Nichia Rigel. So, if you are curious about this particular LED, buy it and be amazed (no-unimpressed and ho-hum...). The barrel is indeed aluminum (I verified this by stabbing it many times with a pocket knife, and produced a shower of metal shards). However, the bezel and critical tail-cap is plastic.
The main failure: the on/off switch is cheapo plastic doo-hickey; not good.
The light intensity as a flashlight: not quite as good as a 2AA mini-m*g LED thingie. If you pull up on the bezel, it becomes a lantern. Here, I do like it; not quite as good as my gold-standard Sylvania Mini-Lantern, but pretty good and an adequate substitute.