1) Testing took place in Colorado, Florida, Oklahoma, Texas, California and and Louisiana. Altitude varied from sea level to 14,000+ above sea level. Within that range I experienced no noticeable difference.
2) VERY durable. Water and impact resistant. If you look hard enough you should be able to find a Youtube video of one being run over with a truck.
3) It really varied a lot. Charge times were extended by as much as 2 hours depending on cloud cover, etc.
4) Correct! Any NiMH batteries.

Thanks for the questions!

Good questions! It folds up flat, so you can just tuck it in a pocket on your bag. The whole setup weighs something like 10 ounces if I remember correctly. Light enough that it doesn't present a problem. You can see in the picture of the panel opened up that there is a little pocket with a velcro flap. I just stuck the battery pack in the pocket and it never overheated. That might be a concern if you have the batteries out in the open, but it wasn't a problem for me.

Great question! The longest I ever went between charges was ~2 weeks so I can't really give you a good answer on that. No problem in 2 weeks though.

I honestly don't know. I searched the Oakley website but I wasn't able to find any prescription lenses, they have everything else though. All different shades of colors, even photochromic. Who knew? It might be worth a phone call, I hear they have a great customer service hotline.

Man, I know what you mean! The only way I was able to justify shooting them was because they were too scratched up to see through.

Thanks, BamaMan!

We tried!

Hindsight is always the kicker :D I am gonna shoot you an email this afternoon.

I did use it in the course of my review. The source of the water used for my testing was a recent rain storm so the water quality was pretty good already. I experienced no problems with leaking. The manufacturer claims that it is effective against giardia, so if you really did get sick after drinking from it then there is a concern there. I am sorry to hear of your misfortune, and I appreciate the feedback. I will continue to use the filter, and will update this post if I experience any problems with it.

Thank you very much for your input. I see your point, and I agree.