I would take this deal...if I had the money .-.
Some of you are saying you only get EDGE in your locations. Well, T-Mobile is repurposing their 2G/Edge networks and upgrading them to 4G LTE. Yes, all T-Mobile towers will be upgraded. 50% should be completed by this year and the rest by the middle of next year. So coverage shouldn't be too much to worry about. --
source.
Now already being on T-Mobile, getting 1.2GB of data for the iPad, for free is pretty sweet. And that's just high speed LTE, after that you'll just be reduced to 2G. Don't worry, your email should be just fine at 2G speeds. Also, don't forget the additional data you can tether from your phone that is already included, see
here. For example, if you are currently a voice customer with unlimited data on your phone, in total with your tethering, you'd be getting 6.2GB for your iPad, which is still free. And I believe if you still want more data, you can always purchase more straight from the iPad.
The following links should help you guys if you are still lost. Overall, this is a better deal for voice customers, but hey it's also heck of a deal for non-T-Mobile customers.
http://newsroom.t-mobile.com/phoenix.zhtml?c=251624&p=irol-newsArticle&ID=1917639& - Tmobile Press Release
http://www.tmonews.com/2014/04/operation-tablet-freedom-explained/ -TmoNews Operation Tablet Freedom explained