Eh, compared to ESPN when viewing on a desktop it doesn't really feel all that different to me yet.
My main complaint that made me want to put a hole in my monitor was the fact that -- after pausing the stream and coming back to it, if you click in the center of the screen to unpause it the way you could with ESPN+, the fucking app decides to fuck off onto some random Paramount program. You have to specifically pause/unpause using the play button at the bottom of the screen or the spacebar. This is infuriating to me as a design choice. I'm watching what I want to watch, why the fuck would I want to transition to another program directly from my chosen bit of entertainment? If I really wanted to, I'd damn well go back to the menu or, you know, use the search function.
It doesn't help that I've got years of muscle memory of clicking the center of the screen built up from ESPN+. Also, once I make the mistake, I gotta go back and decide between either starting the stream over from the beginning or going Live. Neither option is attractive if, say, I paused the broadcast when I was three and a half fights through the Prelims and came back hours later to catch up.