It's a tough one. The ROI calculation described above (I've not run the figures myself but assume it's accurate) suggests that, in the market as a whole, MBAs are not actually valued that highly (otherwise the additional incentive would pay off the investment). However, a lot of people have the feeling that without an MBA their career progression will be stunted. I think this is particularly the case in consulting as compared to the wider business world.Ultimately, the value of the MBA is determined by the market and it is difficult to escape the worry that even if you polish your CV, someone who polishes their CV and adds an MBA will be advantaged.What I would say is that you shouldn't underestimate how much you can do without an MBA, how much experience you can gain in the same time, and how big an effect taking time out of the workplace in order to study has. When you do an MBA, not only are you unable to spend that 12-24 months building experience and demonstrating your ability but you also lose momentum. Your progression in the job you hold in the year prior to the MBA is curtailed because few organisations will give promotions or responsibilities to someone they know is leaving (even if the organisation is sponsoring the MBA and expects you to return, it doesn't help them for you to take on a new role then step out of it for an extended period). Subsequent to your MBA, you have to re-enter the workplace and get up to speed with a step change in role (if you aren't returning to the same job), and you aren't in a great position to excel for a while.For disclosure, I do not hold an MBA. However, I did my undergrad degree at a high-ranked MBA business school and meet with MBA grads at our alumni events. In terms of conversation, people's job levels, and presentational skills, it is very difficult for people to distinguish which alumni hold an MBA, which a BSc (and which hold no degree but attended an executive programme at some point). My point is that these alumni events are not a bad proxy for typical interview scenario (and given how many jobs are won via referrals, this is in fact a typical interview scenario) - having completed an MBA has not detectably improved those job candidates' stock or relevant work experience, apparent knowledge or intelligence, etc. Beyond potentially helping a cold-sourced candidate get through the door, I don't see that the MBA advantages these candidates particularly.I'm by no means a high-flyer, but I've been asked on more than one occassion by MBA grads how I managed to get the job I now hold without an MBA, having graduated at the same time as they did. The simple reason is that in the two and a half years they spent out of the workforce, (due to time commitments to GMAT preparation, MBA applications, the MBA itself, and job hunting) I continued doing my job, took the promotions and opportunities that came my way, and built two and a half years of experience and reputation.Certainly, the baseline for success in the business world has moved up from a good set of A-levels to a Bachelor-level degree, but I don't see that the MBA is anywhere near that level of significance (per the number of Directors and those in the tier below who hold the qualification). In fact, whilst there has been recent talk in the UK of Masters degrees becoming necessary to mark out graduates, the wider trend globally and especially in Europe is to standardise on the Bachelors and get graduates into the workplace earlier.For the foreseeable future, non-MBA Masters will remain for academics and MBAs will remain relevant for people moving into business or changing direction within it.