I recently sold my 6.5m Slick 2023 and replaced it by a 7m Ventis.
The 6.5m was above a 5.5 as my center wing, which I absolutely love. The 6.5 was for my 1.81m not that easy to pump at it's very low end. Tipps hard to keep off surface. Even though the measurements of span are very close to the 7m ventis, the ventis sits differently in its to be pumped position. The ventis is really a genious wing (thanks Ken Winner) as I can pump onto foil as soon as it carries itself. Very grunty whilest totally stable and controllable in gusts. It's fun to freeride and only downside is that my pockets aren't deep enough for the dlab version as the weight difference to my 5.5 slick is significant.
I've paired it with the new Free 1500 Front and it's a perfect Combo as the 1500 still has a lot of liveliness of its smaller 1250 sibbling, but gets you going significantly earlier. I could not try 1750 though, but expect worse top speed I would not want to give up.