Not sure what lb test flouro you got but alot of people throw flourocarbon with bottom baits (jigs, worms, dropshots). It also is usefull for crankbaits and jerkbaits under certain conditions. Increased sensitivity, less stretch, and less visibility to the fish are the main reasons to use it. I wouldn't suggest it for the pop-r though, flouro sinks and will probably give you fits with topwater.