my conclusion from going to and from szczecin by regional trains: outside of sometimes shitty seats, and, well, time spent travelling this is by far more comfortable than rawdogging it in 111A-20 for twice the price
voice announcements (if they exist) are minimal and if you get a modern EMU, it’s soooo quiet in there you can just go to sleep
similar level of comfort is oferred by sprinter IC trains which there’s not many on this line