I have a Midnight MiniChamp II that's been in my pocket for two years. It's a chunky little thing, about 58x15x16mm, but it's worth carrying. You won't even notice it on your keychain, but there are eight different implements, of which I admittedly only use six regularly... I don't have much use for the cuticle pusher or the awl hook. The red LED light (the shield is a button, very well done) is bright enough to look through your car. I'm on my second ink cartridge, so the pen gets used... mostly to sign recipts and such. The relative thickness of the knife (it's basically square) to other small SAKs is an asset to me, since it makes the implements easier to use compared to one or two-layer models. The thing is cheap to replace, yet I've never had a single problem with it.
Mainly though, the scissors, screwdriver (a tiny magnetized Philips), bottle opener, pen and warnecliffe blades are just bloody useful. :thumbup: