Combined BA + MA degrees

Have any of you done these degrees? I'm switching disciplines for my MA, and I want to collect information on this alternative method should I fail that this summer. I'd have a more complete grasp of the field and proceed to a PhD equipped with better knowledge. The price to pay being some time, but I'll probably already have to do my MA---if I manage---in three years b/c the school might want me to take an extra preparatory year going through some undergrad classes.

So, any experiences, any comments, any links highly appreciated!

P.S.: EU information appreciated, that's been significantly harder to get at.