Seeing 'em and catching 'em are 2 different things. I spent 2 frustrating hours at Fontana Lake one time. I could see the 6-10 nice fish watching my lures go by and occasionally following but the only strike came on the first cast. I'd rather fish murky water where it's a surprise even if you miss fish that you don't know about.
Also... I have a fish finder and net for my kayak now. So far, these are the best fish repellants I've ever used.