Great but too long to be a keychain..
937287
A little longer then a keychain but still highly detailed and cool to look at. It almost looks like it could double as a letter opener
4139039
I use the as a MFA device voor AWS. It's ok but a bit too bulky to hang on your keychain.
3022928
Very good quality.  A little longer than I would like for a keychain but it's worth the safety.
4697147
This lanyard is almost perfect for use on my medical alert pendant.  I say almost because it is too long for someone only 5 foot tall.  If it was about 6 inches shorter it would be perfect.  If anyone knows how it could be shortened I would love to know.
4932777
My only complaint is that this makes for a heavy keychain.  But, I like having the time at my fingertips, and I haven't had the battery die on my yet or anything.
2497165
Just beware -- it's really really SMALL.  So small that I wouldn't buy it again because it's really easy to lose.  The only reason I'm not giving it 5 stars is because the key ring is also so small that I can't get it onto a keychain and that is annoying.
2837999
This item is nice however it is much bigger than I expected. It is very bulky when putting it in your pocket with your keys. Had I known the size I wouldn't have purchased it. But the quality is good if you want a bigger keychain.
997352
I like the keychain in general, however, noticed the pieces that are made to hold your keys on the ring itself and the ring onto the keychain can be unscrewed quite easily, i advise putting locktite on them!
2194004
The mini key chain digital tire gauge was received quickly and worked right out of the box. The back light works well and the reading responds quickly with a good seal. The only issue is it isn't so 'mini'. It is too large for a key chain. I put it on my motorcycle key chain, so we will see how that works out. Check the measurements before you purchase, otherwise a great product.
3178419
Even though I cannot use this small key case, because I need a key case that holds the 2 big "smart" keys for my 2 vehicles and this can only hold one and still fold and snap, I give it 4 stars because it is everything claimed, and it is not the case's fault that I bought one too small for my needs.  I did want to post this review though for anyone else who might have similar thoughts.  Leatherbay's Large Key case is about 3/4" wider, actually the same size as the worn out key case I am replacing, so I will likely try that next. After doing a bit more reseach that is.

Update. See my review of the larger Giudi Catena leather key case if you too need a roomier case.
26850
i love this keychain. its been apart of my life since i first got it. Its got tons of applications. Only thing i wished is that i would have had the instructions on its uses. I didn't see anything in the box it came with. Thank god for youtube. p.s wish this had a bottle opener.
506721
I love the sword. This is an adorable keychain. The only complaint I have is that the sword come out of the sheath too easily. I won't be able to use the keychain for fear of loosing the sword. I am going to have to make shift something to keep the pieces together. Perhaps a mini leash or something.
3435190
I thought the keychain idea was terrific.  It packed a big punch in a small space which we all need more of theses days.  It works farhter away than advertised, also.
4091093
no keychain ring,..how much would it cost to do that? Without a ring, it WILL get lost. Do people just carry these around in their hands, pockets, sox? They make it so "secure", then they make it eminently losable,..I don't get it. The USB drive on my keychain has been my little friend for over 3 years,..the rest of them, I have no idea where they're floating around.
16455
Nice keychain well made, ring is a rough one to put keys on.
1646076
The way it retracts and such is really cool.  The only downside I can think of is the little puny thread-like string that holds it to your keychain.  I picture it snapping off one day... bye bye data.  I guess you can beef it up yourself though.
2458822
This really is a great keychain design. For one, it is solidly built, yet not overbearingly large like a kubotan or even a stinger keychain. and Two, and this is huge, is that it doesn't look like a weapon. Other self defense keychains look like that's what they're for - beating someone either with your keys like a flail, or punching / stabbing them with. This keychain is covert. If I ever have to punch someone with it, I'll update the review with how it turned out.