Pros: Loudness, Design, None
Just got this item and tested it for loudness. This thing is pretty loud. However, the only thing I had to compare it to was and old ACME Thunderer sport whistle. This Howler whistle is definitely louder. Best thing about it, it requires less lung power. The only thing that keeps this from getting a five is that it seems to be made of an interesting plastic. Looks cheap, but I need to carry it around for a bit to find out about it's durability. BTW, mine came with brass rings for hanging as opposed to a lanyard that passes through like the picture above.