I managed to get it to work with images that were looking down on the character / thing, like in an isometric game. Using any image that was facing the front was giving flat results

Yea another miracle tool... Until you test it.

I've been testing it and it's the best one I've tried so far.

It does have failure cases but the success rate is fairly high and when it works, the resulting meshes are reasonably usable (maybe not to game dev production standards - but that still leaves plenty of other use cases)

I just asked for low poly plant on Adobe Firefly, then uploaded it to Trellis

The result was pretty good for the mesh, at least 100x faster than having to do it from scratch