My biggest issue now with the sCO F seats (Koito) is that they seem to have fallen in disrepair. Very rarely do the seats recline 'evenly'... in my experience, the seatbacks seem to tilt more to one side, usually toward the aisle, which is uncomfortable. Also, some seats feel like the recline mechanism is poorly adjusted, as you'll sometimes encounter one that will go back way more than it is supposed to. The cushions are worn out, as well.

The sUA Recaro F seats seem to have withstood abuse better than their Koito counterparts. The BE Aerospace F seats on newer 737s are pretty crappy too, but generally in better shape than the Koitos. I find the headrest wings on the BE seats seem to loosen rather quickly, though.

The new F seats need to be broken in, but I like the additional storage, greater behind-leg support, power outlet accessibility and additional bulkhead legroom on the Airbus. I am ambivalent on the recline, which is definitely less than the sUA F seats used to have.