I have noticed something very significant as I am learning to use REVIT MEP (RME).
This as compared to learning REVIT Architecture (RAC) and REVIT Structure (RST).
RAC and RST are mostly about molding the 'materials' into place.
RME is all about placing fixtures, fittings, and equipment within a logical system.
I look at it as 'Materials' vs 'Parts'.
Bottom line....RME needs parts (families). Lots and lots and lots of parts (families) with all the correct specifications.
So then, just as I turn around Autodesk has just released new RME content which you can get from the link below.
FYI - I had a problem unzipping the downloaded file from the link below (could not overwrite an rfa file) so I extracted it to a different folder from the default folder and then manually copied the files to the Library folder.
Here's the download link (metric and imperial content)
More REVIT Content Downloads at these locations below.
Broutek Mechanical and Piping components.
USC Interiors, Lighting, Ceilings