A couple thoughts...
First, I LOVE LOVE LOVE my double BOB. Love it. The push is amazing. I push it uphill every single day with my 35 pound toddler and 12 pound baby in it and it's the easiest thing ever.
Second, it folds up soooo bulky. I drive a Toyota Highlander (big suv) and it barely fits in the trunk. And the trunk has to be completely empty. And we have to jam the stroller in there at an angle, which is difficult for me because it's so heavy and awkward when it's up that high. Because of this, I only take it in the car when I absolutely need to. It lives in the garage 99% of the time. I took it to the Zoo by myself once, and literally almost left it there because I didn't think I could get it in by myself. I finally had to hold it with both arms, and lift up my leg, and kind of kick the stroller up so that it was the right angle for the back gate to close on my trunk. Not awesome when you have two crying kids to deal with. So make sure it will fit in your minivan!
Third, I've taken it to the mall a few times, and it's ok. I mean, I have 2 little kids...so, WTF do you want me to do?? It's not anymore bulky than a double snap n go or a double Graco or whatever.
Fourth, it still pushes great when only one kid is in it, it's not "lopsided" at all, not even slightly. That's the main reason I bought it.
I really do love it very much, the only issue is the bulky fold, and I still use it constantly, so it doesn't bother me too much, ha!
Hope this helps!!