I think their worth running with the same caveats as
evolving wilds.
If fixing is super important to your deck, but you're budget wont stretch to fast fetches, then they're fine.
I personally wouldn't run these in addition to fast fetches. I think if you can afford the good mana bases with fetches, duals and shocks then these aren't worth it and I'd run basics over them.
They seem to exist in a weird middle ground. If you want fetches but don't want to spend the money on them, you probably don't have the lands to accompany them to make them good. There are the other cycles of lands with the appropriate types like the Amonkhet dual cycling lands, but then you are running glacially slow. If you're playing budget but happened to crack a couple of shocks in the recent Ravnica sets then they're worth it.
Additionally, if your meta is slow and casual enough that a fast mana base isn't super important, then they're still decent enough. If that is the case, you're probably not spending too much on your decks anyway.
I like them over
Evolving Wilds in two or three colour decks because they work the other way around. Wilds enters untapped but the land you get is tapped. These enter tapped, but what they get (probably) doesn't. This allows you to use them more responsively. Say you're playing Scarab God and you have a
Bad River untapped. You've got
Swan Song and
Tragic Slip in your hand. Suddenly, being able to get one or the other untapped is real nice. You can be responsive in what you get and get all the upside from it depending on the board state and appropriate threat assessment.
They're probably one of the first things you upgrade when you're looking to take your deck to the next level, but for the most part I think they're good enough for those middling decks.