Thought to throw in the 2bobs worth. I surf NNSW waters and have been a serial dawn patroller. I've only ever used shark shield because it's functionality is based around science and it's the only product to offer itself up to independent university based scientific testing;
www.swellnet.com/news/talking-heads/2018/12/10/shock-and-flaw-dr-charlie-huveneers-shark-repellents-and-otherUsed to have some videos on their web page as well, Ocean Gaurdian now. WA govt even subsidises their surfers to purchase them because the companies done the science hard yards in this regard.
If your serious about shark mitigation then look behind the snake oil claims before splashing the hard earned, make these companies accountable for predating on our fears for a dollar. Science can and should be put into the R & D of these products to ensure their efficacy.
We've just had the mullet run and are midst bait fish schooling atm (where the Kingscliff surfer recently got taken) and the whales are starting to migrate pass with their deadly entourage and I'm not fkg around with the snake oil crew for my safety.
I've no affiliation at all, just a surfer and occasional spearo who did a bit of homework and enjoys the piece of mind. Having said that I don't use it all the time either and it's not on my sup.