Do any of you have any information about Virgin Mobile?

I am looking into upgrading to a smart phone, and recently someone told me Virgin Mobile http://www.virginmobileusa.com/home.html seems to be a great deal, $25 a month for everything. I am pretty ignorant on these matters. Is it $25 a month for everything, like an AT&T plan for iphone? I noticed on another part of the site http://www.virginmobileusa.com/mobile-broadband it seems it is extra for broadband. What does that mean exactly? Is that for web access? It’s all very confusing to me.

Thanks in advance for your help.