Water bottle with carbon filter

These bottles from Bobble have an activated carbon filter attached to the spout. It filters out chlorine, funny tastes, and odor. The filters of course need to be changed. They cost $7 to replace. So, would you pay the initial $10 for the bottle/filter set? I think this would be a good travel bottle, since filtered water isn't always available, and I still have problems drinking from the tap even though I know it's safe.