CADmep was discontinued, it's features were rolled into CADmep. Not to start a pissing match between Autodesk and its competitor, but the direction both companies are taking toward Revit are competently different. Make sure not to make the mistake of comparing the 2 thinking they are the same.
Do a quick search on here and you can find conversations that have been started on this topic. You can also find information on this topic posted on the Linkedin forms.
I'm sure others can add comments about this, my views and opinions (what I truly think is the right choice of direction) will be biased based off my position working for an AD reseller