I recently flew EWR-LAX and back, business one way and economy (ended up being economy plus) on the way back. Supremely unimpressed by the business class seats; did not lean back significantly more, or provide significantly more leg room, than in economy plus. Not worth the extra miles, which is why I didn't fly back business.
I recently did the same; had to book in I because there was no saver economy available. EWR-LAX was a brand new 739, so the seats very nice and comfortable. What stood out the most was the service, with the FA taking my jacket when I got on and making sure my glass was always full. I was sort of upset the flight was so fast (5 hours and 1 minute).
On the way back, it was a 738, and I was happy I didn't waste the points on first, as the seats were old and worn and the plane itself was just rather nasty.