I just started carrying one of these on my keychain. This is one of the part included with some of the Swisscard models. My main inspiration for this was trying to find a way to fill the void in phillips sizes that my Leatherman presents. What I wanted to carry was something around phillips #0. Most multi-tools seem to be lacking in phillips sizes in my opinion, usually with just one size that is somewhere between #1 and #2. It also has a smaller, but not tiny slotted size, which the Charge also lacks. The Charge does have the tiny bit driver but mine sees very little use. The Quattro fits very nicely on my keychain. It slid right onto my small stainless steel twisty without any modification. Sure, I could have carried some of the supplemental bits for the bit driver, but this is much neater, especially conusdering that I prefer pocket clip carry. There are other advantages, too: it may be useful, say, if I need to loosen a screw while holding a nut (with the pliers on the Leatherman) at the same time, and for times when I'm not permitted to carry a knife, I may be able to at least still have some screwdrivers instead of loosing both (I do not carry a dedicated knife). A knife and screwdrivers and definitely the tools I use most. The thing weighs next to nothing, is very thin, small overall, and is cheap. It may not be practical for high-torque applications, but all things considered it packs a alot of functionality into a tiny package.