Well, I am with Virgin which uses Sprint towers at a bit less of the cost. Or sprint has a no contract plan which is also great that I would definitely recommend getting. Both are much better than the prices for other carriers in my opinion and with this overhaul and my experience with using the 4g LTE, it's certainly super fast and worth the price.
EDIT: and to answer your speed test question...I don't have the stats yet. I got a new iPhone 5 after being an android guy for several years and haven't gotten the hang of everything yet. But it is so much faster than 3G just from loading YouTube videos and pages.