I have had my own modem for years and just upgraded it to a brand new Arris Surfboard SBG6900-ac modem which is supposed to be good for 300 mps. Spectrum insisted I would have to at least put there modem online before they could turn on the 60 mps. After waiting 2 weeks for the modem to arrive I finally called to see where it was. They had no idea but they would see if they could get the 60 mps working. It took 45 minutes with tech support to get it turned on but now I am getting download speeds of 77.77 and upload of 7.66 according to speedof.me and testmy.net.
So I have waited 2 weeks for the higher speed only to have it connected without their modem. I asked the very dumb question "what should I do with your modem" and was told to "store it". I felt like saying I charge $10 a month for storage since I didn't need it in the first place. Anyway speeds are now up and I am happy. Maybe I will get the modem one of these days. Looks like the new company is taking up were the old one left off.