Great alternative to the key rings.
354512
This fit my dog's tags perfectly and is far superior to the key ring style we previously used. It was able to get it onto him while he wore his collar with a bit of effort, but if I had taken off his collar it would have been no problem. It seems very sturdy.
2103060
Discussing the aesthetics of key rings might seem like a stretch, but I really like having something like this cute Python clip on the same ring as the Gerber mini-tool and Shard.  The Python clip is useful, of course, as a clip, but it also provides some balance.  Finally, add the fact that Python is a scripting language that I use and, well, all parameters have been met.
525206
This was a great little find! I wanted something that held all my keys, and allowed me to easily separate them. I love that its a bunch of little key rings. Its better that the one that just separates into two. Now I can keep all my keys together and just put my my car key or my home key in my pocket for hands-free fun.
1458642
Works well! It's true that there weren't any instructions that came with the key ring but there were many helpful reviews on Amazon that helped me figure it out easily. It can be a little frustrating at first but eventually it gets easier. To get it unlocked, twist the keyring into a figure eight. To lock it up again, place the ends of the key ring together first and THEN twist into a figure eight.

The key ring came by itself in a regular mail envelope. It was thinner and smaller than I imagined but all of my 4 keys, 1 SOG key knife, 1 electronic door fob, 1 eyeglass screwdriver, and 1 flashlight fit onto it with plenty of space left. The keyring is thin enough to fit through all of the different holes but thick enough to reassure you that it'll last. My key ring came in red but the seller said that you can contact them right after placing your order to choose a color. (If you want to contact them, you go to your Order History, look for this item, and then click the Contact Seller button)

The main reason I chose this key ring instead of the cheaper, more painful split rings is because I like having the option to easily and painlessly take out keys even though I don't take them out very often. I've owned this for about a week so far (as of September 17, 2015) and I will update my review if I experience anything else.
4353873
These work great for RFID entry system fobs.  They are easy to install and small enough to fit easily on a persons key ring where the key ring is too big for the hole in the fob.
819685
Just what the title says. These are a great alternative to the cheap little keychain carabiners that fall apart after a few months.

So far, these have been super durable and very lightweight.

In particular, the latching mechanism seems like it will last much longer than the kind used for keychain carabiners.
88511
This is a little over priced in my opinion but still love using it. I hate the sound of keys jingling in my pocket and this solves that problem. It is a little harder to get your keys lined up and neat like they show you in the pictures but one you have them locked in it's a great accessory to have. Is slim in our pocket, no more jingly keys and KeySmart also has some accessories that go with his such as a USB or bottle opener. I use the two in one key ring so I can detach my car key from my house keys if i am out and about and want to have a minimalist feel.
1807046
I liked these. I used them for my key rings. It would be nice if the had an adhesive on the inside to seal them, I used a stapler and then I used tape. I guess I could invest in some double sided tape next time. I will certainly be buying them again. Thank you!!
1628820
I have used these key rings for a long time. I really like the way this one opens to add or remove a key---once you figure it out.
2744818
I love that these rings make it easy to remove keys! Takes a little practice at first to get them unhooked but once you get the hang of it, it's super easy.
3919210
This is a nice key ring.

I was worried when I first got it because the key rings are held on the end loops by a sliding pin mechanism.  Having used this for a few months, now, I have no worries.  The pins take a little force to open, so you won't be accidentally releasing the rings.  To use GMC's term for their trucks, this key ring is "professional grade".

I have my vehicle keys on one end and the house and shed keys, as well as all of those dang store loyalty card things, at the other end.
1217395
I really like this item, my last one had a threaded closure which would unwind itself and randomly dump my keys everywhere.  The closure is solid on this yet easy to open and close when you need to.  My only gripe is the stiffness, a more pliable cable would make it more comfortable in the pocket.  That being said integrity and strength are not in question, unlike some other soft key rings.
2752438
I bought this to replace the Maxpedition Keyper. I can put multiple key rings on it and loop it on my 2" wide belt, then lock it on for security. Now I KNOW that my keys are safe and not held on with Velcro. I had an incident in the Boundary Water Canoe Area once with a Velcro pouch getting detached while going through some really dense growth, but luckily the person behind me found it. Now what if that had been my keys and they had not been found?
Sure this item may seem like overkill as a key ring, but there is something to be said for piece of mind knowing that my keys are very secure from accidental loss and theft.
4837050
This is a great "keyring" - prior to purchase and just looking at it I wondered if really was going to be any more convenient than the way I was keeping them now but after a couple of weeks of use, its been great.  Less wear and tear on my clothes, easier to have keys ready for use, able to hold a large number of keys in a compact package.  I had concerns about being able to pick out the right key when they are clamped together, but that turned out to be a "non issue"; works out fine...
2808971
I don't like the main ring, but I like using the smaller rings on all my keychains. They are a good shape for preventing rings from slipping off larger rings randomly
2293210
I like it better than I thought I would. No more keys jingling and I can have my entry key ready to open my door so no fumbling there. I put a
round key holder on the strap rather than the oblong ring they provide. I didn't didn't feel comfortable with the split ring it had. I would purchase again if needed though.
3900720
I purchased this set last year for my mother after she permanently misplaced her keys, and the company also sent me another set to review. Since then, we haven't lost any keys or had to use the product (so maybe it brings luck :) among other benefits?). Two observations: 1) The receivers are very convenient to carry on a key ring. They even help in feeling around for keys at the bottom of a purse. 2) There is one design flaw. My mom's transmitter battery finally ran out, and I went to replace it with the battery that comes with the set. Well, the battery compartment is held on by an exceedingly tiny Philips head screw that requires a very small, almost jeweler's size screwdriver to remove. Luckily my husband had one and luckily his vision was good enough to do the job. Given that the people most likely to use this product are old and farsighted, I'm surprised the company didn't use a thumb slide or some such on the battery cover.