For me, it was a no brainer in getting it. Why? Even though I know Nalegene's are not lightweight by ANY means, I have gone back to carrying one after all these years. I am having so much dental work done it is uncomfortable to drink out of bladders, and last summer my Snapple bottles got a funk-y odor after 5 days. Not sure if it was the bottle, the Aquamira, or a combo of them. Needless to say, my water was gross tasting. So I ended up going back to 1 Nalgene. Usually my other bottle is a normal water bottle from the store that I buy on the way there. I carry a bladder for camp use.
Anyhoo, I often read in my tent for hours, and wearing a head lamp is not comfortable to use (I like laying on my stomach) and neither is using a headlamp easy when changing clothing in the tent. So hence, I thought: This can sit there and light up my tent. And use it outside in the evening, by hanging it.
Sure, it is extra weight, but my pack is light enough at this point ;-)
I'll call it my luxury item!
But then again, you might hear me cursing after this weekend ;-) So far though, using it at home, the light is diffused and not harsh. I like that!