I picked this board up yesterday - Carbon Reflex model. Specs say 241cm x 95cm with 147 litres. Weighs about 8.4kg bare hull. There are a lot of footstrap positions to choose from which is very good to get the right balance point for the sail, foil and rider style. The board feels very solid - not super light but apparently a lot of strengthening has been done in the construction compared to a normal slalom board to handle the inevitable crashes and foiling stresses.

I first tried the board with a 5.7m sail in about 18- 20 knots of wind and was very impressed with the stable feel, footstrap positions, nose touchdown bounce (the soft forward rails definitely help here), and pumping onto the foil. I have been using a Formula board for foiling for the last 6 months and this board feels a bit more balanced when hiked out on the rails, probably because of the narrower tail and therefore back footstrap position. Upwind leverage and angle feels similar to the formula board (good!) and down wind feels similar as well. The foil 147 is probably a bit easier around the corners compared to the formula board.
I'm keen to see how the board goes in "windsurf mode" - the underside tail shape narrows the tail width so it should be interesting how it planes with a big sail and how it gybes. I've not owned a lightwind slalom board (apart from a formula board) so I guess I have nothing really to compare it to (my biggest slalom board is an iSonic 107). This board is not an iSonic and is clearly geared to foiling, which is where I'll be mostly using it but I hope it still is fun in windsurf mode.
I'll report back more on both foiling and windsurfing soon - I should have some faster foils soon as well.