Yes, but it's pretty straightforward. Helps that I'm used to old software and hardware interfaces from tinkering around with race timing gadgets all these years.
I was a bit apprehensive about the Etec when I first got it, my first modern outboard. Computerized everything, direct injection when all I'd ever had was carburetors. But once I downloaded a service manual and connected the engine to the EVDiag software, I was impressed by the wealth of information and diagnostic tools available. Following the sequence of tests in the manual, some with a multi meter, some via the software, it took me less than an hour to confirm that #3 fuel injector was not providing fuel and needed to go to a specialist. Not a guess, didn't spend $700 on a hunch, the tests eliminated everything else.
For this amateur mechanic at least, Etec is easier to work on than the earlier two strokes I've had. Those engines need lots of subjective assessments for diagnosis: what do the plugs look like? What does it sound like off idle? Is that butterfly opening a hair sooner than the other three? Us occasional wrench pullers don't have enough experience to be attuned to this stuff, we don't know what's normal or not normal. But the digital engines tell you when there's a problem, and provide tests that isolate it to a specific source. That's a lot better for a part timer like me.