I have both the squirt S4 and the micra.<br>After I got the squirt ( for my wife actually), I was so envious of the better tool deployment (especially the knife) that I wanted to switch the micra with her ! <br><br>Basically like what you already mentioned<br>1. Tools deploy from the outside like the wave<br>2. The knife in the S4 is single ground like the micra. Knife on my micra seems sharper though, but nothing a diamond hone can't fix. Access to the blade on the outside is reason enough to get this..<br>3. It is smaller, lighter and cooler looking.....<br>4. the cap lifter is sturdier than the micra (more victorinox like actually)<br>5. The rest of the screwdrivers are well,...screwdrivers.....but slightly more sturdy than the XS one on the micra.<br>6. The tweezers are much better, since they are free like the one on the SAK<br>7. I have not got the Squirt P4 yet, but i'll be going to next week!! There is a small victorinox leather belt sheath ( for the minichamp i believe) that takes the squirt in very nicely too......<br><br>I may very well leave the wave at home if I do get the P4.......<br><br><br><br>