I had a chance to try the new Y on a 77H last week, albeit on a regional 3+ hour flight. I felt the seat was a lot more comfortable than the old sliders. I enjoyed the recline. I enjoyed the touchscreen. I like the little things like the USB and cup holder.

Fortunately for me, the pax in front of me didn't use his recline button all flight. But from the looks of others, it's not something I really need to experience.