I own both and at the moment I use my 6Key more than the Cles but I think the Cles is a more practical choice if you only have 2, 3 keys (I have 7!). Here is what I think of the pros and cons of each...
Cles
Pros:
-fits more than just keys. you can easily fit some cards, cash, coins etc and use it as a catch-all
-can be clipped onto almost any purses for easy-to-reach
-can be use as a small "purse" for running quick errands ie cards, keys, lip balm even (again)
-protect the inside of your purse when keys are stored in the pouch
-no need to worry about glazing issues in the long run. (I have yet to see/read about stitching coming apart so that's a good thing)
Cons:
-unless you leave the chain part with your keys out all the time, when you have to use your keys you have to be careful when pulling them out of the pouch so everything else don't fall out
-if you have too many keys then you really can't use the pouch for storing anything else unless you leave the keys out but by doing this you can't protect the lining of your purse if it's delicate
6Key
Pros:
-good if you have many keys and like to keep them organized
-can fit about 2 cards or some bills in the "slit" spot underneath (which is also a con if you want to fit more)
-protect the inside of your purse
Cons:
-doesn't really fit much other than keys
-personally I find it a bit hard to find if I'm carrying a big bag (always have to fish for the holder forever!) but maybe I'm just very used to having big distinguishable keychain (this obv can also be a pro if you want something compact)
-again this is just how I feel but I find it a bit difficult to open a door (especially a heavy door!) with the key attached to the holder like I'm afraid I would damage the holder or something BUT mine is 20 yr old and the condition is impeccable so *shrug*
-if you have a big fob the holder may not close so you will have to leave the fob hanging outside
Bottom line is you should consider what you want/need and what works for your lifestyle.
I love the Cles but I need to carry many keys so I prefer to keep them organized and separate from everything else and I simply use my Cles as a small catch-all(hair tie, bobby pins, lip balm) or a quick errand "bag". By doing so I also get to protect the lining of my purse and whatever else I carry in there which is why I bought the SLG in the first place.
Good luck and happy shopping!
