Lack of coverage...
Of course you could just stick with XP and log into the world's largest ISP (linksys) instead for free, but what do we know.
It's funny that this keeps getting put in every news posting about some new commercial wireless provider. However, I've been in several airports, quite a few bookstores and even the occasional Starbucks. None of these locations had a "linksys" or other open AP visible. You're virtually certain not to find one smack in the middle of a large airport (DFW, anyone?) that's nowhere near any residences.
Opinions expressed here are mine and not my employer's. This posting is provided "AS IS" with no warranties, and confers no rights.