I picked one of these up on the recommendation of a family member.  I carry a a bunch of keys for work and have a total of 12 keys on my keysmart (including my 2 house keys).  I also added a Kingston thumb drive (which is handy to have just in case, but I may remove it since I so rarely use it).  I ordered my key smart with the extension kit (this item alone will not accommodate all of my keys).