I noticed on my last flight with Ryanair (Rome-MAN) in Aug 2014 that they had the new slim-line seats.
No tray-table, no pocket full of the previous pax's garbage and the emergency instructions stenciled onto the back of the seat in front. Oh, and no window blind if I recall correctly.
It didn't bother me one iota. The 4 x Euro 25 we paid as a family for the trip more than made up for it.