I love my new Underground FLX with double concave ...

555 GREAT BOARD REAL SMOOTH IN THE CHOP UNREAL POP BUT SHARP EDGES 3CUTS AND COUNTING

I'm riding a 555, I'd say not great in the waves, but its ok, bit skatey, however the white things/inserts (for lack of a better word) that you put on under the heal side edge fins makes a big difference in chop/waves. But on flat water its sooo good!! I was riding an underground before and the 555 is so much smoother and i'm getting a lot more pop from the 555 and the landings are soft and the board corrects itself quickly if you land a little off.

I also give the Nobile 11/10 for their foot pads, the are super comfy.