Robert Lind wrote a review of Hydro Photon SteriPEN Freedom on January 19, 2013
Familiarity: I've used it once or twice and have initial impressions
I have used it a couple of times just playing with it. Bought it for my bug-out bag to use in conjunction with a filter. I plan on charging it with my Joos Orange solar charger. A solid investment to ensure safe drinking water for a long time.