Ive definately been impressed with the ATT LTE speeds in most areas ive seen user accounts from, including in New Orleans, the only thing i will say ive noticed, and this is a completely unscientific test, just an observation, but holding my iphone 5 next to a verizon i phone 5, both with towers in the open mall parking area, I would notice the ATT would often peak higher than Verizon DL speed, but after getting mid 50's as opposed to verizons 35, but after 5 minutes of running tests, My ATT LTE iphone 5 speed tests would drop down considerably, at one point down to about 6mbps down and a few up, HSPA+ speeds really, whereas the VZW stayed incredibly consistent and wasnt all over the place with highs and lows, it literally just kept getting 35mbps down every damn time i ran the test, no peaks or valleys, & obviously theres a case to be made that that is far more desirable than sometimes being 2x as fast and sometimes being half the speed. Im also thinking there is some modem firmware updating needing to be done, for a few reasons, the LTE speeds of the verizon iphone were much slower than that of the Galaxy Necus in the same store, which literally doubled the performance of the LTE speeds on the verizon iphone 5, but also for my LTE on ATT, I've noticed its very often "quickest right out the gate" it will slow down to very slow HSPA+, but if i turned data off or toggled LTE/airplane mode and ran a speediest, it would instantly be back to getting the fastest possible speed. Not sure if its just degredation of the quality of the LTE link over time or as devices connecting to the tower more recently take priority above devices which have had an active ink for a long time and are more likely to be idle, im not sure, just a couple theories based on my experiences , try this and chime in with your experience if you find simlar things happening, best way to test is just doa a speedest when u first power on, and either again much an hour later or even better if u have unlimited data or enough to experiment just run a bunch of tests back to back and see if results deteriorate when compared to a speedtest done immediately upon connecting to the network. Thats all, sorry for the long post.