If you're a compete foil beginner you may not feel an initial difference but through progression any dedicated foil board will give you a much better balance and trim versus a crossover windsurfing board.
I have used the JP 135 with the NP pinkie foil, NP/F4 carbon, Naish thrust and currently using the slingshot foil with 84 infinity wing. Each foil will give you a different performance and it's the wing that's gives you an easier feel.
The JP 135 was really designed with a racing pedigree foil like the F4 or Starboard race foil, hence the reason why the straps are further out on the rail. With a racing foil you'll tend to hike out over the rail.
With a freeride foil like the Naish or Slingshot you'll stand with an upright stance with you back foot more over the center line and really only using the back strap to pinch upwind.
The board is 215 x 86 so plenty of float, width and very stable. I will use this board in super light winds with a 7.0 or 7.8. Anything stronger and I will switch to the slingshot wizard foil board 198 x 78.
Overall you can't go wrong with the JP and if the pocket book will allow it, go for the carbon pro 135. It is very light and will foil up quickly. The construction is very good and has lasted me very well so far.