i've been testing a little and so far it seems like a solid sourceport except for some nitpicks i have like no easy option to limit to 35fps (you can still do it with console commands and vsync off) and midi not using system midi for playback so i can't use my own soundfont with midisynth.
however, there are some wad breaking bugs or oversights like linedef 247 direction being reversed and silent teleporters like 267 and 269 not being repeatable.