Somewhere between. I originally wanted to make lap joints larger than the KM-1 (I have one on order) can handle, but I was impressed with the simplicity of its principle of operation. When I watched the Bridge City video, my reaction was "Of course! Why haven't I been doing that?".
As discussed previously, I have a wobble dado blade and I'm too cheap to spend for a real stacked dado set - and I picked up on the "kerf width" paradigm.
For both of my simple jigs, I can use the wobble dado to make the cuts shown in Figures 1 and 5 (and Figure 7 and 8 of the box joint jig) to produce satisfyingly precise joints.
(Note that in making the box joint jig, the cut-off from Fig 6 is glued into the slot cut in Fig 7 to ensure exact finger spacing.)
It's not exactly nirvana, but it comes close because it's quick and easy to make, wonderfully thrifty, and awesomely accurate.
Click to see the full signature.