I can't vouch for it, but I have some listings up on tim to try it out. The dev is responsive. Don't want to post the link here but I have a simplex group if anyone wants to discuss, message me.
I don't want to encourage people clicking random .onion links. I can send you the link to my simplex group which has the .onion link in the welcome message.
Seriously though, the way that we are able to trust a .onion is by having many trustworthy people post it in multiple public locations, then we users can look to see if they match.
Its more sketch to get it in a DM than a public forum where others can comment on its legitimacy