Carrier restrictions and branding is why I went with the Nexus One (then onto the Nexus S).
Android is open which is why (ironically) carriers and manufacturers can close it back up again hardware wise and software wise.
Regarding at NebulaClash and yg17's discussion, it is unfortunate that the current Nexus S doesn't support both AT&T and T-Mobile 3G in the US on a single device but the rest of the world can reap the rewards of an open, unlocked phone.
Android is open which is why (ironically) carriers and manufacturers can close it back up again hardware wise and software wise.
Regarding at NebulaClash and yg17's discussion, it is unfortunate that the current Nexus S doesn't support both AT&T and T-Mobile 3G in the US on a single device but the rest of the world can reap the rewards of an open, unlocked phone.