All I can say is that was my experience with the HR54 and C61k. I found them to be sluggish compared to the Tivo Roamio OTA + Mini that I was switching from, and when I moved to the Hopper3 and Joey 2.0, it was a welcome speed-up. Trick-play on the C61k was especially slow. There was a second or more delay when I hit pause, rewind, ff, etc. The Joey 2.0 is fast enough that I am not sitting and wondering whether my button press has been recognized by the STB. It is still not as fast as the Tivo Mini was, but it is usable, whereas my C61k was not. I had a tech check the Genie setup shortly after I got it installed, and everything checked out, but perhaps my experience was unusual. I certainly hope so for the sake of all the DirecTV customers out there. My parents' DirecTV setup includes a different, not UHD, client box, but it seems similarly sluggish to my eye.