I have an ACE and NASM cert for training. I had difficulty finding any kind of reimbursement from my employers for my ACE cert. NASM is alot harder, more in depth in my opinion, and more credible and recognized.
Though you do come away with some good information with certs, in no way does it really make you qualified to be a trainer. I've seen guys with certs that really can't train at all, and I definitely wouldn't take advice from them.
I guess opposite of MikePT, I'm finishing up my training and going to be moving on to something else. The pay is excellent, it's a fun job, and the business is thriving right now despite the economy. Have fun, good luck.