I know this is a topic that likely gets kicked around every year, but how about a quick run-down of everyone's favorite system and why. I'll start: for about 4 or 5 years now I have used a steripen adventurer, with a iodine tab back-up. The back-up unfortunately has proven necessary a number of times due to steri failures, usually because my batteries fail. I'm not saying this is the best system, but I find it very convenient and lightwight when all is going well. I am wondering if I should give a Sawyer a try,though, but it looks like a hassle.