I agree with Ryland that they are a great kitesurf board.
I have been riding a 5'2 non kite version that I bought second hand and is awesome board.
I have creased the deck and had it repaired (carbon patches on the deck) and keen to get a kite version asap.
I weigh 80+kgs and it is by far the smallest surfboard I have kited/surfed.
IMO around that 25litre volume is spot on for my weight.
Demo one if your in the market