Here's a cool video I stumbled across. It's all walk-throughs of Revit MEP. Still don't have your engineers using Revit MEP? Let me ask you a question. Who pays for your engineers drawings when you hire them? You? Thought so. Don't you have the right to ask them what deliverables they give you? After all, isn't it your money? OK, now that you've done that, wait for your clients to start requiring you to use BIM and IPD because it's their money and they want to reduce Change Orders and delays. See how that all works?
YouTube - AHA Engineers 2010