Nexus 4 and Straight Talk: How's the service?

For those of you who have the Nexus 4 and have been using it on Straight Talk, could you answer a few questions for me?

1. How are the data speeds?

2. Where do you live? (I travel quite a bit, and would like to get an idea of what to expect in certain cities)

3. Do you experience lots or any dropped calls?

4. How do you manage after hitting the 2GB speed limit on Straight Talks unlimited data plan?

Thanks in advance for your answers. I've slowly but surely have gotten more and more fed up with skinned/custom versions of Android and have seriously considered just pulling the trigger on the Nexus. I may simply complement the data portion with a Verizon LTE Hotspot if I need to.