This is just my personal opinion, but MBA's are really only good if certain jobs require you to have them.
My employer, at that time, paid for my MBA. I had a dual major of Marketing and Finance. I was living in Chicago and had the opportunity to go to Kellogg School of Management at Northwestern University. They had a Program that emphasized International Business Study as an Executive MBA. We met for class on Fridays or Saturdays for about 2 yrs. It was somewhat helpful, but really helped my pocketbook more than my business knowledge. I jumped my salary about $20K in the early 90's. Not bad.
Like I said, if you are looking at certain opportunities that require an MBA, or that your main competition will have an MBA, then you might consider it. However, it's costly, time consuming, and may not deliver all that you are expecting. Good luck with your choice!
BTW, I can't write you a recommendation into Northwestern. I wrote a pretty nasty letter to the Dean of the Business School (after I got the MBA) about their lack of flexibility due to my travel. I think I've been blacklisted from ever stepping onto the premises of the Evanston Campus
