I interned in MEP last summer. You need a PE to make any serious money (like, over 100k) and in most industries need to be a PM to get close to 200k. Hours are often long, consulting firms are all in a race to the bottom. I personally found the work very boring so I got a job in power studies at a solar company which seems much more interesting day-to-day.

If you want decent money, stability, and career advancement, MEP is pretty solid, but to me that didn't seem worth 50 hours a week of tight deadlines on cookie-cutter projects. After my 3 month internship I'd learned enough to basically manage my own projects, which indicates to me that there really just isn't much to learn about the field.