Water Filters

I've been doing some research on water filters for camping. Right now I've got a UV light stick, but I want to get a filter to be double sure. If you have any reviews of the follow products, post them! All of these products are as listed on REI.

MSR sweetwater

http://www.rei.com/product/617913/msr-sweetwater-water-filter#tab-specs

.2 microns/ 750 L/200 Gallons per filter

$89.99/ replacement filters about $40

Katadyn

http://www.rei.com/product/830746/katadyn-hiker-water-filter

.2 micron (protozoa and bacteria)/1150L/303 Gallon per filter

$69.99/ replacement filters about $40

Coghan’ s 8800

http://www.rei.com/product/888147/coghlans-water-filter-2015-overstock

.2 micron/50 gallons per filter

$14.73 on sale/$13 for replacement filter