I keep my 6-IN-1 Micro-Tech Key Ring Tool with me at all times, it comes in handy in situations where my pocket knife comes up short. I us a pocket knife for most jobs away from the tool box, but the 6-IN-1 is an invaluable addition.
The pliers are actually large enough to grab and hold a nut! I have pliers on my pocket knife which are great for holding things, but they're just not cut out for grabbing and holding a nut. I can use the pliers on the 6-IN-1 to hold a nut while I torque down on the bolt with the screwdriver on my pocket knife.
I also use the wire cutters and sheet shear. Again, I have these on my pocketknife, but they're just too flimsy for a lot of jobs. The 6-IN-1 allows me to take it up a couple of notches on-the-spot, no need to go back to the toolbox in a lot of cases.
The screwdrivers are fine, no complaints. But I rarely use them, the pocketknife is usually a better choice.
The best thing about the 6-IN-1 is that when it folds up it can be made to grip a key ring! No need to provide a key ring, just grip it onto what I already have in my pocket, and there's no key ring dangling about when I'm using the tool.
This multi-tool is the perfect addition to a keychain. It folds up really compact and locks on to a keyring without needing to "thread" it on like a key. That way your keys aren't dangling in the way when you need to use it.
The construction of the multi-tool is really beefy for its size, and the screwdriver "handles" offer just the right amount of friction resistance to turning: any more and they'd be too hard to unfold, any less and they wouldn't stay in place to keep the tool clamped to the keychain ring. The 1/8" graduations on the "handles" serves double duty by adding a gripping surface while using the pliers and as a miniature ruler.
I'm actually glad the tool doesn't contain a knife, so I don't have to worry about removing it before I go to the airport.
Pros: Durable, Sturdy, Good Size & Weight, Nice Design