I was with T-Mo when it was Voicestream and only switched (to AT&T) in late 2012 after a series of bad (beyond the pale) customer service experiences with T-Mo and my interest in the iPhone. I wouldn't say I was sad to leave. Just missed them.

One of the reasons I stuck with T-Mo for so long was exactly it's relatively cheap and hassle free "data" plans for occasional international roaming with my various T-Mo Blackberries (I know there were various discussions/threads about what these plans covered and didn't - but they worked for me). Indeed, my employer was a Verizon junkie when it came to phones/Blackberries, etc., but when you traveled internationally they took away your Verizon device and gave you a T-Mo device. I know there were network/compatibility issues but the tech guys always said when they came to do the switchout - Verizon is criminally expensive abroad, that's why we give you a T-Mo device.

I have to say I do like AT&T's web site and mobile iPhone app. Anything that keeps me away from a call centre is very much appreciated.

Now, T-Mo has the iPhone and this new "plan" which is right in my wheelhouse need/cost-wise. I don't do a LOT or HEAVY data or tether while abroad (I use Wi-Fi). I text, make calls, and want to send/receive the occasional email. So, slow data speeds are not a dealbreaker for me.

I still have about 1 yr on my AT&T iPhone contract. Next year (hopefully with a new iPhone '6' or whatever), when I can potentially switch. T-Mo will be the frontrunner.