I've been using the Drivehub with my G25 in GT Sport for a month, then switched to my new TGT for a month, and returned back to my G25. All I can say is, my 10 year old used and abused wheel with a third party adaptor is NOT inferior to the supposedly "best" GT Sport wheel. In terms of feedback I prefer the G25, and laptimes are similar (after acclimatising to the TGT).
Maybe there is a defect with my TGT (who knows with TM legendary reliability), but I just don't get what the fuss is with belt driven wheels. It does feel smoother, but it feels like you're missing "rawness", especially in race cars. It does make driving long periods easier, but I can turn down FFB in my G25 if needed. You also would never use the full power of the TGT if you set up your FFB strength correctly to avoid clipping. I use Strength 4 with G25, and Strength 3 with TGT. I can't even fathom why people would need Direct Drive wheels.
Countersteering is also a lot less intuitive. You feel the resistance of the belt mechanism, and then the strong motors takes over and you end up overcorrecting. With the G25 and it's low internal resistance it's a cinch sawing the wheel back and forth as needed.
The only plus with TGT is understeer effect is much more pronounced (the wheel would judder when front tires slip), but at the end of the day, it's not telling me info that I don't already know or anticipated. In fact, it's kinda distracting, same with the canned Depth Feedback effects (novel, but not really providing more info to go faster).
Wheel rim build quality wise I much prefer the G25's real leather. Also the stitching on the TGT sometimes have sharp ends where the threads are cut off, especially at the back of the wheel. I had to trim them off myself to avoid stabbing my fingers when driving
G25 pedals are better in feel with different resistances for gas/brake/clutch. The TGT pedals all just feel mushy. I've tried the conical brake mod but I just ended up being unable to press more than 10% brake. Doesn't feel real at all. In GT Sport however, the G25 pedals have this massive deadzone at the end of travel which makes it a pain to module gas and brake especially with ABS off. The TGT has no deadzone at the end BUT it has deadzone at the start of travel, which is more tolerable, racing use wise.
The rotary face dials is the only thing I'm missing with G25. They're very handy in tight online races to adjust BB and Fuel Consumption.
Oh, and the clamping mechanism is also much more secure with the G25's twin clamps. The TGT's single clamp just doesn't cut it. Also the quick release mechanism is a dud. Either I lack strength to tighten it fully (or too afraid to damage the mechanism), but after 2-3 races and some vigorous countersteering I found the wheel rim getting loose
I tightened it again as strong as I could, but the wheel ended up slightly off centre as a result (really obvious with the blue stripe).
I updated the firmware to the latest version as well, not much change.
Anyway, long story short, if you are debating whether to get a new wheel for GT Sport or sticking to your trusty Logitech G wheels - go get Cronusmax. Your wallet will thank you.
P.S. Don't know if possible, but the only thing I would like to be added for Drivehub is a PS button functionality to quit the game. Maybe add it to the adaptor for V2? Or allow us to program to one of the wheel buttons. Because currently I have to unplug the Drivehub, turn on my controller and quit from there. I'm scared that multiple times plugging/unplugging will damage the PS4's USB port eventually. EDIT: Thanks to VBR for providing the solution below 👍