Main issue I have, tested using the Roku 4 was no local networks. Don't care about the news but with networks broadcasting live college and pro FB games can't see this working. Love the pricing and the SD content blows Directv's over-compressed unwatchable junk away. Directv should be ashamed of the SD content they charge premium for.
By SD content, are you talking about the airing of old shows, movies, and sports rebroadcasts that pre-date the HD era? I didn't think PS Vue had any SD channels per se, though I know some channels carry a lot of older content that isn't remastered. I recon the reason the quality would be better than on satellite is that PS Vue doesn't have a separate SD tier where the transmission is different in some way from the HD content. (I had actually stopped watching -- forgotten about, really -- the SD channels my cable company still carried by the time I cut the cord.)
Regardless, HD content on PS Vue does leave a bit to be desired. It's not unwatchable and I can live with it. But flipping between the OTA broadcast and PS Vue broadcast of an exhibition NFL game last night (not to mention the Olympics this past week) tells me I'll still be watching any sports carried by the big four networks OTA rather than on PS Vue as much as I can. The only problem will be when I want to channel surf, for example, games during college football season, when some are on the networks and others are on the cable channels I can only get wih Vue.