This is fantastic.
I would like to see an updated comparison chart in re: effectiveness against giardia for each of these treatment methods (or for each specific product/model). Somewhere not easily findable on the Web, I've seen a chart/article that makes the comparison - but can't find it now, and it may be out-of-date.
I've had giardia (in fact, last year!) and I know now that most people get it from a hygiene lapse - not from bad water - but, still. Tested-in-the-field effectiveness against giardia would be my #1 criterion for choosing my water treatment.