I've used Aqua Mira on numerous trips and as far as I know it performs as touted (not by the manufacturer which makes no claims for it purifying water in it's literature). I leave it to those such as Dr.J to make such determinations.
My warning relates to McNett's claim of each kit treating up to 120 quarts water. The instructions say to use 7 drops each of partA and PartB (15 drops for cloudy water). The first time I used Aqua Mira was on a 15 day trip. The directions said I had plenty of chemical, but I ran dry on day 11. Since then I measured 4 kits and found the Part A bottles to hold 435, 460, 480, and 557 drops. The B bottles held 545, 700, 600 and 518 drops respectively. This means you can count on only around 450 drops of each chemical per kit (once one part goes dry, you're done) which treats 64 quarts, not 120 quarts. BEWARE and plan accordingly.
Other Data: At 64 quarts and $11.04/kit it works out to $.172/qt, 30grams(30ml) liquid/bottle, empty bottle with cap weighs 11 grams(you can use these numbers to calculate how many quarts you can treat when you start a trip with a partially used kit), .93 grams chemical/quart water treated = 1.2 oz chemical for 5qt/day, 7 day trip.