I was given one of these years ago. I've even used it in hill country during the winter. I would not say it is the best whistle I own, but it did the job when needed twice. I happened to have it readily available at each of those instances. So, I'd agree it isn't the best, but what other $3 whistle would you say was better?
BTW, the reason I had it available was that it was the backup whistle, on my belt as it fits in a swiss army knife sheath WITH the swiss army knife and I left my bigger kits out of reach. This whistle does have *some* application given that I can stick it almost anywhere with a little give. Again, I wouldn't put it up against the decibel levels of a larger-sized whistle. If that's my main criterion, then I go for the storm whistle (
http://www.stormwhistles.com/).
Every whistle I have is better, even ones I bought for a buck. I may have a defective one or something. I can't understand how anybody would think this tubular aluminum whistle is loud.
I consider all whistles under $8 to be in the same price range. I base my decision on size, pitch, ease of blowing, etc. When size is no consideration, then it's all about the "loudest," which is fuzzy science. My Storm and my Fox 40 Sonik Blast are probably my loudest whistles. The Fox 40 Sonik Blast hurts my ears the most. However, reports have indicated the Storm carries farther than the Fox 40 Classic (which I don't own) because of the Storm's lower pitch. I also own the Fox 40 Sharx (also very loud) and several generic whistles that give the big names a run for their money.
I just bought some small whistles that are supposed to be loud:
Victorinox Distress ($1 + shipping on eBay)
JetScream ($5 or so on eBay)
ACME Tornado 636 Slimline ($5 or so on eBay)
I'll try to remember to come back here and critique. If I forget, send me a message.