I am in Corpus Christi TX, using an Evo 3D, and I have to say that the 3g is all but useless. It works great for receiving emails and such, but if I want to surf the web, or I want use the net during the day, it has a huge ping lag. At "off-peak" times, it is much more usable. The I guess the speed is not bad once it connects.
Today, on 3g. I got 148ms ping, 792kbps down, and 349kbps up. These #s do not sound bad, but the experience is not very good. We have received enhancements, but I did not find any difference.
Instead, I keep 3g off and use wifi 99% of the time. If I am out and about I turn on the 4g (WiMax). The experience with 4g is much better. outside of the long time to find a signal and connect, it works pretty well.
Today, on 4g (WiMax) I got 228ms ping, 3321kbps down, and 300 kbps up.