I've seen mostly positive reviews for it (outside of these forums, at least) with a reference to bugs that need squashing as the big go to complaint.
Why rely on reviews now though? You can download it and have a go.
That you haven't speaks volumes, doesn't it? Not about you, to be clear - about the product! It's free to do so! But people haven't, and people won't, ever, for the most part.
I think the reaction from the vast majority of people who actually do download and open it (a surprisingly painful process) it will be essentially:
1) This is pretty if a bit plain!
2) Wow it sure is surprisingly hard and fiddly work to actually build anything!
3) Huh I don't have very many options, for like, anything (terrain, monsters, character, rotation, etc). (This is with the paid version note! Free is even worse.)
4) I couldn't see myself using this for every session because it'd add literally hours of preparation (even if you got fast with it), and unless you were railroading, you'd need to do tons and tons of extra might-never-get-used prep (rather than just uploading some 2D maps, or drawing them on the fly).
5) Closes down Sigil and never opens it again.
That said, I didn't know it originally had a 250 member development team at the start. Which indicates that the vast majority of engine-designers were laid off months ago, at this point. THAT is insane.
Yeah we discussed the claim at the time, because it was kind of fantastical, like that's AAA videogame numbers. If I find the source again (which Google is doing everything it can to prevent happening, thx Google, you work so great now), I'll link it through.
Maybe the most killer thing is though, is, even if WotC did think it was "finished", it's only on PC. And you do, as a matter of cold fact, need developers to get it on to other platforms. This product cannot succeed as a PC-only product.
I should correct myself that she left in 2023 though, I was thinking it was "last year", but that's 2024 lol.
Was it 250 people working on Sigil alone or was it 250 for Sigil, DDB and potentially other projects? I'm not sure they ever really made it clear.
Beyond has what, like 40 people working on it? So that wouldn't add up. But she was pretty specific at the time. She didn't say "across all WotC digital teams" or something, she said the 3D VTT (it was before it was called Sigil). I was skeptical of the number claimed, though, so god knows.