"I really love the steripen idea. Love it. And I travel a lot in parts of the world where it would be really helpful. But the reliability of it just sketches me out. Too many moving parts."
Too many moving parts? Where? I count the cap, the battery screw cover, the on/off switch...
I've owned my Steripen Adventurer since 2009, and have used it very regularly (most often daily) on the following trips:
o 2009 - RTW trip, taking in Poland, Ukraine, Belarus, Russia, Mongolia and China - 7 months
o 2010 - Burma and Bangladesh - 2 months
o 2011 - Vietnam, Thailand and Malaysia - 3 months
My Steripen (paired with my Nalgene hard plastic water bottle) have saved me from buying literally hundreds of bottles of water while on the road! Aside from treating hostel tap water, I've also treated water from the taps of some of the filthiest bus and train station bathrooms! And I have NEVER gotten sick.
No one drinking water from filthy Bangladeshi, Chinese, Russian and Ukrainian taps for months on end escapes unharmed on luck alone. No one.
I have seen the UV LIght and I am a Believer! :)