Flew the new J on a ORD-HKG route a few weeks back. It was my first time ever in business class (thank you BA 100k promotion!) and thoroughly enjoyed the entire flight.

I then got to try the old J on the flight from HKG-SGN and was actually quite disappointed. They did feel really claustrophobic and just smaller in general. The new J is a huge improvement in my opinion.

The only interesting glitch was that to open the headphone drawer, I had to give a fairly hard bump to the door to get it open. I thought it was stuck with my camera inside until the FA showed me the trick. My wife's door opened just fine like normal.