I am contemplating upgrading my 2-tuner Series4 Premiere to either a Premiere 4 or the 4-tuner Roamio. I live alone and have only 1 TV; I really just want to be able to record 4 shows at once. My cable provider is Comcast and I do not have an OTA antenna. I already have the WD eSATA external drive and I typically use around 35% capacity. I have 20.3.7 and everything is working OK but the S4's responsiveness just seems like a slug. I am hoping that the Roamio has a much faster processor than the S4 Premiere but am not sure about the Premiere 4. Are the UIs pretty much the same with the Roamio and Premiere 4? Is the Premiere 4 much different, if any, than my 3 year old Series4 Premiere?