I do have the S4 Squirt in addition to the P4. I use the S4 on a daily basis. It has a great scissor on it, probably the best of any multi-tool I've used. A lot of multi-tools use a variation of the Fiskars scissors which I find mediocre for operability. I prefer the S4 over them all because of the blunted face which makes it safer to use and even though the handles are small they are adequate. The tiny blade is useful for opening packages, the nail file/cleaning tool and scissor are all handy for grooming. The tiny tweezers are very tiny and lack sufficient finger surface to effectively squeeze and hold something.

I used the Wave for the pliers and saw and as a backup blade. The S4 blade is a second backup.