Don't know all that much about EFT's program, but I did my CPL there and I do know they are a good school.
However, 18 months is a huge chunk of your life to be doing something you don't really enjoy. The only reason for becoming a flight instructor is because you want to instruct. If you are doing it for any other reason, you may well end up resenting it, which isn't fair to you or to your students.
I've been instructing for a little over 6 months now, and I absolutely love it. I knew I'd enjoy it, that's why I did my FIC before my IR. Yes, money is tight, but I get by - and if it wasn't for the lack of money, I'd be quite happy to become a career instructor.
FFF
-------------