I am actually an UNIBE graduate, I gratuaded August 2005. As far as getting in goes, there is no difficulty there. UNIBE does teach medicine in english, however dentistry is only taught in spanish. I have to say in my experience studying there was a great experience. Since I graduated last year I have passed part I and II of the Boards, applied to schools, have already been accepted into USC and am waiting to hear from three other schools.
I have to say I studied really hard for Part I, having studied all those subjects so long ago, but for Part II, I only studied for a month and a half....I didn't score as high (81), but I must say that 81 came mostly from UNIBEs teachings. Another thing is you have to remember that learning always comes from you....you will always learn a lot if it is truley what you want.
As far as the clinical experience goes, It was amazing! In these countries if you put yourself out there you really have the opportunity to treat a diverse amount of cases.
Good luck and if you have anymore questions feel free to ask.