Maybe I'm just having slight issues because my previous vibes exposure (externally excited, higher order bending and torsion modes of complex structures) doesn't really have much representation in the exam because it's not a very "hand calc" friendly domain.I thought it was acceptable. Not enough to be a subject matter expert but probably enough for the exam. I actually thought the coverage on transmissibility was pretty decent!
The transmissibility portion of MERM is ok, but outside of that I think it glosses over too much, and doesn't do a good job of explaining some key points. Same thing on some of the machine design subjects vs. Shigley. I just use them very often so I know exactly where the MERM is failing (IMO).