I had Sprint back from 2011-2013. The data was so slow, when I first signed up I called them a few times, wondering what was wrong, because there was just no way that the data could actually be that slow. Over the next two years, I had developed a somewhat perverted fascination with the slowness of Sprint's network. I ran speed tests all the time just to see those 50-130 kbps speeds (that's bits, not bytes). It's like when you have a sore in your mouth, and you keep touching it with your tongue just to verify that it still hurts.
And yes, that was the speed I consistently saw. It doesn't matter if it was in the morning, afternoon, or 2AM. It was always around those speeds. It doesn't matter if I was on the east coast of florida, west coast, or in central florida. My phone at the time could use their WiMax network, which did get good speed, but it was the most useless technology ever. It basically didn't work unless you were standing right in front of a cell tower.
I then switched to T-Mobile. The first thing I did was run a speed test. I saw 12Mpbs.