So I currently have century link wifi in my house and its pretty stinky. Constantly goes out for half a day or needs to be reset. Changing to a different provider and thinking xfinity. I see 300mbps for $50 a month but then 600mbps for $60. What do these things mean? I just want fast internet that is reliable and can handle 3-4 devices gaming/moviestreaming and more phones and stuff connected as well. Willing to spend a bit extra for better performance.