I think that this new patch has changed many thing much better, but I find there is still some odd thing happening in multiplayer, spinning cars, total chaos, but much less than there was earlier, multiplayer seem to be working rather well for me at least.
Physics have changed to better, it is really pleasure to drive, at least FF 1600 which I tested, don't know about wing cars, I don't use them, wings are for planes, not for cars, imo.
Force feedback is better than in LFS, really with dfp force effects are really good. Of course in LFS force is perhaps as good with Microsoft FFB wheel, but with DFP there is so much less forces in LFS and also curbs can't be felt when you drove over them with left wheels, unless there is massive weight transfer, so with dfp NKP has better forces, imo.
It is quite heavy so need powerful gfx card, I got under 40fps few times and I don't use any AA or AF things, my hardware is not so good, even radeon x850xt should be enough for sims, I guess.
Patch installation is something I did wrong without instructions, it is completely new install that is needed to do to new folder and then copy drivers and license folders to this new installation, when I did read instructions from rsc it worked better.
Lot remains to be done, I don't know if NKP will ever be as stable and complete product as others are, but it is nice to see progress has been made, it offers some good racing.