Centurylink? That's what I have!
I hope you're in a city or large town, because it does not perform well in rural areas. At all.
I'm rocking 50kbps max, and SpeedTest tells me I'm slower than 96% of America.
I'm in a wooded area, but I'm also only ~20-30 miles from my state capital, and I think we're gonna go with their 40MBS plan. We'll just have to see about that tomorrow. It seems Centurylink is either good or absolutely terrible, depending on location and the type of setup you get. As an avid gamer who would like to play online in the near future, this is making me rather nervous.
Edit: Shows how little I know, I just looked up what services my area has and I can get up to 10MBS, which wouldn't bother me much so long as the latency was acceptable.