I have one in 4m (my profile pic)
Works well, it needs at least 15 knts to be able to takeoff but i dont have a good pumping technique with my legs as i am on a new board (still getting used to) or a compact freestyle board that sticks to the water.
D?cent d?power, I could ride it in gusts around 25 knts i think, but with harness only (it pulls a lot on the forearms). Its very stable in the air. Pretty r?active also i managed to jibe in my first session, trying the tacks now and managing to pull some (its my first time tacking as i only jibed when winging but i think someone used to tack a wingfoil will tack it no problem). Im very happy with it after 5-7 sessions (2 in perfect wind, 1 in 5-28 knts, and three in lighter conditions)
Keep in mind i have not tried any other brands.
Here are some pics, the one with the GPS is to show the angle upwind (i was not trying to go upwind very hard, when i did i was going upwind as well as wingfoilers, in between 50-60? of the true wind angle)


Lasuduna,
What do you weigh and what foil are you on? 15-25kt ramge on a 4m and being able to gybe right away seems to indicate they've gotten things pretty well figured out compared to V1.
Im 75kg with wetsuit and everything on, was on a 4'9 80L board but switched to a 88l 6'6 board. I only used for now a 1100 veloce V2 from Gong with a 180 tail, but i will try next time with my freestyle 800 foil i think in 20 knts i'll be able to takeoff. I will buy a foil with more aspect ratio probably around 900-950 cm2 and 10/11 AR next for parawinging i think to be confortable but still b? able to carve
I have to say tho the 15-25 knts is an estimation, and for the top end it only works well if you are still pulling on the sail, when in huge gusts (probably between 25-28 knts) if I tried to depower the sail collapsed violently. So I managed to sail in those hard gusts but i couldn't release power at all...
After seeing other brands vids I also think the Neutra is not as stable as others when depowered and high on the flight window, but for upwind-reaching, as long as you put some power into it even a little bit its extremely stable. Coming from wingfoil i had no problem managing it in my first flights, its automatically sits in front of you and stays there.
I do believe its not as good as the Ozone and maybe the Flow (altough the shape feels similar) but its nearly half the price so for me its perfect