I've not done any art with it but I did have to build a little plugin last year to handle some naming issues on an older painter version. from what I remember you get a texture set per tile and you can paint across tile boundaries - i forget whether it's possible to assign a different shader to each texture set. on more…
Painter docs seem to indicate their UV Tiles system is different than regular UDIM workflow. But what’s different here? Isn’t it just a single material getting multiple texture sets, like most apps do with UDIMs?