My first experience with a foam core paddle was the Diadem Vice. I’ve tried to find a foam core paddle that was approved, even though I only play rec pickleball, and the J2NF is the closest, much better than my CRBN Genesis 3. With 6 grams of weight at the 3&9 positions, the J2NF is my most favorite paddle. I did try the J2 NFK first and the NF has the touch and feel I prefer, with loads of power when you need it.