User Review: SteriPEN Classic
Price Paid: $80
Works great, until it fails on you. I have had my Classic for one season, that's it! It worked on my first couple of overnighters of the spring, and then the indicator light went out.
The problem is that humans cannot see UV light, so you have no way of knowing if your water is getting purified if the indicator light is off. I sent it back, and they repaired it.
Nevertheless, I wouldn't waste your money. I have read numerous other complaints about this product, and I will probably just buy a Hiker Pro filter next year. Live and learn! If you get one, make sure you have plenty of drops/tablets as backup (which you should have, anyway).