I spent much of today roaming about San Francisco. I rarely found less than 5 bars. (I didn't go into the winding streets around Twin Peaks, where T-Mobile's dead zones are, but I will this coming week.)
I made a good number of calls, which were crystal-clear, much better than via T-Mobile's network on my RAZR or Treos. (I haven't tried Apple's headphones or my Motorola Bluetooth headset yet.)
So, on iDay+2, I'm thrilled.