I just flew with LOT and I don't plan on ever flying with them again.
I paid an extra fee for reserved seating - meaning i was able to reserve the exit seat for my transatlantic flight. When i got to the airport the agent told me they switched equipment to an Air Italy plane, and becuase of that they no longer had the exit seat for me. He put me in a bulkhead seat instead, but that was not what i paid for. During the flight i noticed an exit seat which was empty!
On my return flight, it was even better. I didn't find out about the equipment change until i got on the plane, and the seat i had reserved turned out to be a middle regular seat. When I told the staff, they once again put me in a middle bulkhead seat.
The most LOT would do for me is say they will refund what I paid for those seat reservations. To me this is worth nothing, as i wouldn't have flown LOT if i couldn't have those seats. There were cheaper and similar options available.
{end rant}
