If you don’t have time to get to the meat of this, here’s the final judgment:
Cool little gadget, but I’d rather have my money back.  Didn’t gel for me.

I have a few jangly keys in my rotation that I use on a regular basis. The amount of room they took up on the rings, plus a few extraneous membership ID tags from businesses and the county library, caused quite an unsightly, uncomfortable pocket-lump.  And I wanted to smooth that issue out as best I could.  I got one of those Cool Item Offer Emails-de rigueur one morning and there was a key-taming solution: KeySmart. And it was ON SALE! Thank you, Cookie-logging Data-gathering Online Shopping gods!

So I bought one, the red one, so I could start slimming up my key ring, and come roaring into a world of thinner key configurations and numerous configurations adapatable to my lifestyle!  HELL YES.  And when it arrived, I was pretty amped.  So I got to work on it.  I bought the slimmest one because I was determined to narrow down my keys to what I actually use on a daily basis.  That’s 4 keys, not including the chipped ignition key for my boss ride (2000 Accord PAID-FOR STRAIGHT CASH WHUUUUT). And no membership cards.

After the first 24 hours of use I thought I had done something wrong.  I mean, it’s a gadget, a thing that addresses, but doesn’t necessarily SOLVE, a problem, so maybe I wasn’t in the flow of maximizing this thang.
The keys I needed were tucked neatly away, but nearly inaccessible with one hand (think: carrying bags up to the front door, need to put ’em down).  It looked cool, this pocket-knife-like key organizing implement, but, uh… I couldn’t easily access the most-used keys (home, office, cabinets) because, well… they were neatly tucked away in the KeySmart.  After a month of use I have gone back to my Middle Earth “ONE RING TO HOLD THEM ALL, AND IN MY POCKET BIND THEM” usage, but at a greatly reduced quantity.  The KeySmart is outta the rotation, and maybe I can use it for something else.

PROS:  Slim, good look, expandable, accesssories, capacity restricts extraneous key holding.
CONS: Can’t one-hand a key if the end-screws are snug, kinda pricey ($15-$40 for the Titanium model), restrictive return policy (send it back unopened)