This is a Leatherman PST, which stands for Personal Survival Tool. Ordinarily if write about how iconic and important this tool is, and it absolutely is- but you can read all that here: https://wiki.multitool.org/tiki-index.php?page=PST
You probably don't remember this one, but I was thrilled when I saw it for the first time at the SHOT Show in 2011.
I love Wenger Knives, and this serrated Journeyman is an excellent example of why.
With so many plier based multitools on the market, the Guppie from ID Works (produced by CRKT) with its adjustable wrench was achieved needed change.
Gerber's Flik multitool may have been short lived, but that is more likely due to its complicated design rather than it's popularity.
What kind of people would write collect and review multitools? Quite simple really- we are designers and do-ers, outdoors types and indoor types, mechanics, doctors, problem solvers and problem makers. As such, we have, as a world spanning community, put every type, size and version of multitool, multifunction knife, pocket knife and all related products to every test we could manage in as many places and environments as there are.