After losing my micra, I thought I'd try the P4. As the previous owner of a Micra (The other keychain multi-tool by Leatherman) I am a bit disappointed by this Squirt P4 tool. The convenience of this tool over the micra is that it has a pliers and Awl, unlike the Micra, and a "better file". The pliers is nice, as are the screw drivers. However, unlike the micra, the bottle opener is more of a struggle to use. I would have to think twice and look for an alternative before I'd consider using it. With the micra, it seemed like it was a little longer and fit the curvature of the bottle cap for better leverage. Also, this tool has a file with serrations on both sides, which is nice, and the tools are accessible from the outside of the handle, which is also nice. However, if I were a designer, I would have masked the edge and portions of the file that are exposed when closed such that it didn't snag the inside of your pocket.
I owned a micra for a few years and really appreciated the convenience of having it. I may grow to appreciate the P4 tool, but I probably should have just purchased another micra.