100 Way Bra

I have a wedding coming up next weekend, and I am planning to where this Diane von Furstenberg dress (but in all black):

As you can see, you can't wear a normal bra with it because of the back (which I LOVE, it's one of the reasons I bought the dress). I have been searching for a special occasion bra, and I found this one at Victoria's Secret called the 100-Way Bra.

Here is a picture showing the 100 ways it can be worn:

I am thinking about investing in one. Anyone tried this? Does it actually work?