Most of the time I stick with my good old Leatherman Wave, which I bought sometime around 2004. It's a pretty good all-around multitool, with all the limitations of a pocket do-it-all gizmo. I also ordered the bit kit, which makes the Wave that much more useful for fixing stuff.

For small-scale work I also use a Leatherman Squirt. It's surprisingly handy when it comes to fixing electronic gadgets. Very compact but good quality.

In all honesty, I don't use my multitools nearly as much as an EDC pocket knife (Spyderco Endura for the most part) or even a SAK. In the field, what I need most of the time is a good blade. No multitool can rival a fixed blade or quality folder in that regard. But for basic repair of anything mechanical or electronic a quality multitool is very useful in a pinch.