Yes I am in the MBA. It's a good deal, cost wise, but it has it's drawbacks. For one, you don't get a summer vacation if you do MBA. Also, I have heard from a couple P3's that it could interfere with getting the rotations you want come third year. If you do get a "summer" (ie: you fail a Pharmacy class), you will have to do that class instead of one of your MBA classes and I suppose you will either make up the MBA class in third year or finish it the summer after you graduate with your PharmD. I think it's easier for those who transferred a couple of business classes in.... I didn't, I have to do all of them at Roseman.
I think it's a good option if you really want to run a business or be in administration. A benefit is that the PharmD students in the MBA program make friendships before the rest of the class meets for the first time, so it's easier to build more relationships that way. The MBA/PharmD students are "closer knit", I would say.
Just my opinion/experience so far. Best of luck whatever you decide!