I used it three times yesterday; once while at Kinko’s printing out some rebate forms, once at Starbucks while I had an hour to kill before a movie, and once at Borders while waiting for the MAX to go home.
I think it’s great T-Mobile is giving this service away now instead of charging $20 like they used to. There are 33 Starbucks within a two mile radius of where I live, so I see myself ducking in there a lot to use the internet.