I don't know whether to make my comments here or in the drive hub forum...but I am here now so I'll go right ahead.
Note: I have never owned a GT title, I have never played any GT title more than 10 minutes and I have never played it with a wheel.
That said, even though I still will be trying to figure out whether there were any communication issues between my Thrustmaster TX, PS4 Pro and my CPX, I was terribly impressed with my first go around.
I was surprised that with only mild intuitive adjustments, even on Professional I felt like I had more control over my car than in Forza 7, and PC2, although to be fair to PC2 I really haven't dialed things in yet.
Quite simply, though, having played all three games to some small degree now I can honestly say this might be the most fun driving I've had right out of the box.
As stated I am a little worried that something may be "lost in translation" between my wheel, the drive hub and the PS4 as I had to set all setting up to 10 on the FFB to get a reasonable feel from it. However, I am still so very pleased that my recently purchased Drive Hub works, and furthermore, I did enjoy the comfortable control over my car while on the track regardless of who credit should go to: Polyphony, Collective Minds or Thrustmaster!
This is getting close to a definite buy for me, but again, I really need to see where I am at with the DH and whether it is giving me a reasonably accurate interpretation of GTS.
I will say I was not able to use my Thrustmaster shifter, but that may be due to another issue entirely, I don't know. I do know the DH recognizes my wheel as the 458, which I believe is accurate as it is the same TX servo for both.
Wrapping it up, again, I must stress that I was surprised how much I enjoyed my driving experience with GTS and I am now a little disappointed that after the next couple of days I will have to wait a week before experiencing it again!
Peace, my friends!