I despise quackers!!!! Maybe in the right hands, its nice, but it seems to me the most talkative/annoying people have them and underwater,,,they are now talkative and annoying just the same..only underwater.
For a signaling device for an emergency they are great, very loud, If you have air. However...for the amount of use you are likely to get out of it, they will likely not function when you really need it. They do need to be rinsed, and taken then care of. I've seen people that have had them for awhile, then one day test it for kicks, and find it doesnt work. I wonder to myself... how long has it not worked???
I blow my whistle...and think....huh...still works. Sometimes....simple is best.
I also dont like the added "stuff' on my inflator hose, the added weight, flopping around. Yes..I had one...I took it off and threw it in the bin with other crap I wish I hadnt bought.