- Familiarity: I've put it through the wringer
I am very weary of backpacking with anything battery dependent, but this thing has converted me. It is nearly weightless yet the casing is really sturdy. It is so easy to use. Super easy. There is a single button, and the light on it lets you know when its done, if it was successful (occasionally it will flash red if you pull it out too early), if the battery is running low, and many other things. And it doubles as a flashlight for rifling through your bag. The only downside is that you have to use a widemouth 1 litre bottle.
The real reason I dropped the money on it is because it doesn't alter the taste and treats everything. I love that I can now drink the amazingly delicious mountain water and know it is safe. Nonetheless, on long backcountry trips I still keep a few iodine tablets in my first aid kit, just in case.