Sorry if this has been mentioned or if its widely known. I have Roku and YTTV and while there is not single "last" button if you double press the down arrow, it brings up your 4 previous channels. So you can pretty quickly switch between multiple channels which is great for sports.
For OP, I think the DVR on YTTV is the best out there. It functions pretty much like everyone is already used to with pause, rewind, fast forward, etc on live and recorded shows. Other pros: you can customize your channel layout which you cannot do on DTV Now. Girlfriend has DTV Now, and while it has more of the channels that she likes, to me it feels way behind YTTV in terms of functionality. Also a plus that has not been mentioned, is Google Cust Service. I've only had one true service interruption. About a day later, Google emailed me, apologized and credited my account $10. Which is consistent with how they handle mobile data on Google Fi. I don't have to call them, they just automatically give me a credit.