PS VR2 was designed from the ground up specifically for PS5 – so you’ll notice that some key features, like HDR, headset feedback, eye tracking, adaptive triggers, and haptic feedback (other than rumble), are not available when playing on PC. However, other high-fidelity and sensory immersion features of PS VR2 are supported, including 4K visuals (2000 x 2040 per eye), 110-degree field of view, finger touch detection, and see-through view, as well as foveated rendering (without eye tracking) and 3D Audio in supported games.
Adaptive triggers is not surprising I guess, but even the haptic feedback? Eye tracked foveated rendering as well, imo all this combined with the price tag for the adapter makes this not a good option. Only if you already have one and always wanted to try PC VR. And even then I’m not sure if it’s worth the adapter price.