I've played v0.7. It's definitely fun and worth a try. One thing it does nicely is to keep play moving along. It doesn't drag much.
The Yahtzee-style dice manipulation in particular is quite fun, but after I got used to that, I feel like the rest of the game isn't as interesting. In combat, it feels like you're usually trying to do the same thing every turn. Slay the Spire solves that with systems like showing enemy intents and combat with multiple enemies. I think that enemy intents might work even better in DD than they do in StS, because in DD you almost always have access to all your abilities every turn. (I haven't played much StS, though, mostly because of pacing.) Here's an article about the StS intents: https://www.rockpapershotgun.com/2018/02/19/why-revealing-all-is-the-secret-of-slay-the-spires-success/.
Pacing?
I've been playing some Slay the Spire. It's good, but does not necessarily scratch the rogue-like itch that much, kind of like FTL. Also kind of like FTL, a run takes one to two hours, so it's not nearly as much of a time commitment as, say, a DCSS run.
It does have fairly granular difficulty levels, which is good, because the basic difficulty is on the easier side. You might still die a bunch as you get used to the mechanics. There's currently three characters (with maybe more coming after launch as DLC?) which play very differently. I think some balance still has to be ironed out, but for an early access game it's already excellent.
I'm actually not enamored with the intent system. It's mostly there to make the existing defense system viable (pay energy for cards to block damage, with block expiring at the end of the turn), and I think StS would have been a better game with a different defense system altogether. Cards like Barricade, Blur, or heavy Ice sphere channeling somewhat break the game. But overall it gets the job done.
Something that I was a bit worried about at the beginning was the artstyle, but it's grown on me. The whole thing feels somewhat oniric and original. The newer assets look a lot better than the older ones, and the main characters have no animation (besides idling), but eh.