Seat assignments mean nothing.
Pros: According to our reservation we had seat assignments (not marked seat requested) but when we checked in they assigned us seats in the back of the plane. When we showed theconfirmation and seat assignments they checked and said a family with children has priority so they gave our 2 seats to them. However when we got on the plane we saw that it was not a family but 2 separate individuals. Not sure why they got our seats but it obviously was not because of a child. Another flight with them several days earlier we also got our seats reassigned but the flight confirmation on that leg said seats requested so when they reassigned us we could justify the airline thought that request is different than assigned.