I have Vivint Internet, but I didn't get to be a hub home. I would have jumped at the chance, but my house is not positioned centrally in the neighborhood, so I'm not a good choice.
Anyway, I've had Vivint since February. I switched from Comcast. With Vivint I get much better up AND down speed than I had with Comcast, and it's less than I was paying for Comcast, with a guaranteed fixed price for life.
BTW, you'll get faster than that 50 mbs they quote you. That's what I drop to during peak times. I average in the 70's and 80's.