They have been FLOODING atlanta with advertisments, and I hear several people say they are getting it, but heard little about actual service performance.
Still, $50 for unlimited wireless internet with speeds approximate to what you'd get off bellsloth's DSL (3 megabit?) isn't a bad deal, if indeed you use it on the go around town. I've heard at least 2-3 non-authoritative sources say Clear plans to actually DROP the price once they get a critical mass of subscribers. If that were to actually happen, I'd be shocked, but it would definitely jumpstart the use of their service.
Personally, for me, I'll keep comcast. Guess I'm old school like that. I can tether my blackberry if I need emergency internet away from home and im not in a wifi hotspot.