If your firm is doing M-E and P than It
can work, as long as there isn't a request for your model.
If the deliverables are 2D construction documents.
If the intention to model is for in-house coordination.
If using Revit MEP 2011 is better, faster and easier than a previous release, than I say absolutely.
Things like this shouldn't hold us back.
When 2010 came out no Architects made the switch. We knew that the 2010 release had major improvements but we couldn't use it.
Now I look back and think why didn't we just do it anyway.
I don't see any reason why they would need your model. Actually maybe that should be in the contract for an additional fee.
"It's hardware that makes a machine fast. It's software that makes a fast machine slow."