I had Koni yellows on my first NSX and thought they were quite harsh, even on the softest rebound settings. I was running the old Comptech progressive lowering springs on that setup. I was not a fan of the ride quality. But then again I think the NSX-R shocks are quite comfortable!
I think the Ohlins will be much, much more comfortable. But they are more comparable to some of the higher end Koni shocks, not the yellows.