Sling is divided into a couple of tiers - the two main ones are Sling Orange and Sling Blue.
Both have different channels - I think they share a few of them, but for the most part, its like having two different “cable packages” but a la carte, so to speak. Orange is $20 a month, Blue is $25 a month. If you get both, it’s $40, not $45.
The Sling Orange service offers 30 channels including ESPN, Disney Channel, AMC, CNN, HGTV, and more. The Sling Blue service offers 40+ channels like FOX, NBC, regional sports (geographic restrictions apply), NFL Network, FX, and more.
I add on the Sports Package for $10 which gives me NFL Redzone. If I remember correctly, I did Sling Blue and Sports for $35 a month. Blue will include NBC, NFL Network and Fox, which are the primary ones for football. I was shit out of luck for Giants games on ESPN unless I did a trial service for a week on a bootleg email.
I was also able to catch some of the Twitter games through the web browser as well. I use Sling on the Xbox, so I believe you can use the PS4. Sling DOES have an option to play back SOME of the episodes of SOME of the shows, but not much really. However, if you have the PS4, you might want to compare Playstation Vue to it.
I primarily use it for NFL games, NBA games, and rewatching some Tru TV. Maybe another thing or two. I usually only subscribe between Sept - Feb