I didn't go with the PS4, but with the Swiss + Tech Utilikey for concerns of weight. I'll see how that goes.
I haven't found myself needing a multitool and not having one somewhere. Thinking back to my usage (of the stuff I do carry around), it seems that the knife is the most often used, followed by flashlight, pen and paper (or some sort of notepad), bandaids, and prybar. On the other hand, maybe if I have a multitool readily available I'd find uses for it. The Utilitkey is kind of a compromise -- it's small, but it's got "screw drivers" and a bottle opener (the latter I did need recently).
Because I need a pen so often, I thought about adding the stylus/pen from True Utility -- it's a telescoping pen basically. But it's kinda expensive. It's cheaper just to carry an actual pen somewhere in my pocket.