I have travelled on several of the Seacats including the ones out of Newhaven and never witnessed the vomiting reported by others here, although the Cherbourg route is a long way.
I think LD Lines timetable their crossings so they need less crew! If the boats are operating all day they need several crew changes. If they stop and rest a while they don't!
Anyway must find out if my crossing has been re-timetabled.