I was a total DBM snob the entire time I played WoW. Never even considered trying BigWigs because I told myself that surely they are both the same basic thing, one is just as good as the other, and I certainly don't need to switch.
I read the article below and it has changed my mind. It sounds like BW is a lot more sophisticated than DBM and would probably have helped me not die in a fire as much.
The blog also shows some setup screenshots to give you an idea of how to do the neat stuff - that may be what I found most interesting.
Happy raiding, all!