Different things work for different people. What works for you might be very different from what works for me.
When I first started using a PWC, I preferred the Permobil foam seat cushion.
As things progressed, I discovered that I really prefer and need the Roho cushion.
Now, the foam cushion feels OK for about the first hour. It is uncomfortable for the next hour or so. Then, it is quite uncomfortable after that.
The one cushion that just absolutely does not work for me is the newer Permobil foam seat cushion that has a cutout with (I believe) an air cushion or gel insert. That one absolutely destroys my bottom! The sharp transition from the foam to the insert puts too much pressure on my thigh/bottom transition.
My new F5 will have a Roho cushion.
Steve