Lots of noises for fish to contend with. Graphs, TM, hydrowave, voices, music, outboards, and on and on. I think the FFS guys use the "fish are getting scared of it" line to minimize the tremendous fish catching impact FFS has. I've heard guys say I'd still catch them without FFS. They might, but there are a lot of fish they'd never known were there and never casted to that they caught with FFS.