I haven't done JMBR in a while, but if I recall there was a moderate amount of plank work, and the cardio was mostly high impact (but not all of it - especially in Phase 1). If I recall, the "frontside" workouts in Phase 3 were pretty plank/pushup heavy.
They sell Phase 1 by itself now - in fact I just saw it at Walmart for about $35! You might try that, then get the other phases (they'll inevitably be put to retail by themselves too) if you like it. They DEFINITELY progress and P1 is much easier than P3. I would say P1 is intermediate done as-is.
I know modification can really change a workout's intensity, but at non-modified I wouldn't say JMBR is any harder than JNL. But I did everything high impact and a lot of JNL's cardio intervals were tough! I suppose they are pretty different though to compare. It depends on what your strengths are.
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