My 2 cents on the Comcast / 4K thing... They began rolling out the XG1v4 box about a year ago, but for new customers and "pro install" only. About 3 weeks ago, I chatted with Comcast online and they said that was no longer the case. They could ship me one for $15, or I could see if the local store had them in stock. My store had just received several units so I got one.
Outside of the absence of a clock (which I do miss), the XG1v4 is a step up over the XG1(v3 in my case). It's quieter as there's no fan, though the hard drive still makes a decent bit of noise and puts out a lot of heat. The upscaling is massively better than the previous box and for some reason, even the picture on the XiD companion box looks a lot better (sending a different codec to it, perhaps?). During the Super Bowl, even when the confetti fell, there was almost zero pixelation. The XG1 is miserable for sports IMHO as the low compression Comcast uses just falls apart, so whatever processor the XG1v4 uses is a lot better.
As for programming, yes, all they have is a lousy and slow implementation of Netflix and the delayed Olympics coverage. With my schedule, I haven't been able to watch any Olympics live (well most of the main coverage is also tape-delayed), so the ability to watch it OnDemand, in glorious 4K HDR / Atmos without
commercials is not a big deal to me. After watching it on our OLED TVs, it's painful to go back to HD SDR coverage.
Also, Comcast will begin more 4K broadcasts at some point and you'll need this box for it. Since it doesn't cost anything extra, I have no regrets.