YES! I was just thinking as I came back from a flight on a 737-900 that I'm going to avoid the 737 fleet as much as possible from now on.
Night and day difference compared to the much more comfortable A320s -- it feels like the padding on the backrest of all those 737s are all worn out making it pretty hard and uncomfortable.
On my last flight, I did look back and see that economy had updated seats (737-900) -- I wonder if they'll ever update the 737 fleet in F or is it kinda stuck with the same old seat design due to the DirectTV PTVs?