I run 30" bars. I always ran 28" bars, but switched over last year.
I get alot of questions, funny looks, and doubts, but they are catching on in the market and I'm sure alot of people will convert soon. If you ride agressively and have average broad shoulders, then the ammount of control, stability, and comfort gained is really incredible. If you ride trails that are "too tight" for bars that wide, then you never would have gotten up to speed feel the benefits anyway. I recommend them, from XC to DH.