Product review (4 stars): Happy to have these, but I think the design could be improved.
I'm happy to have these. I can't speak to their effectiveness (thankfully) but some other reviewers have attested to their life-saving usefulness!

I'm dinging them a star though because the design could be improved. The nail (as you see in the picture) lets the can dangle down about a half inch. This just means I can see more "ugly" (sorry, these things aren't pretty!) dangling from the range. I wish this were shortened up, and I wish there were options to get these in different color labels. How about White and Black guys? Or White & Black cans, with the labels being on the top & bottom so that there isn't this ugly red label peeping out at me from under the range?