Do it if you are interested in the content - you would probably be learning material above and beyond the qualifications you already hold. However, I agree that a third Masters won't add much to the immediate impact of your CV - consider for example if devoting the study time to overtime in your current role, or taking on extra projects, might enhance your CV more.The OU is about the best in the world in terms of distance learning and the content of the MBA is pretty good compared to most business schools. However, although there are face-to-face tutorials, the course has less cachet and there are not the same networking opportunities as you would get with a fulltime MBA at a top business school like LBS, Warwick, etc.