Fanatec's are buttery smooth and I think most of the people who comment on notchiness have come from them. Just as those with OSW/Bodnar wheels who try the Accuforce say it's not as smooth but it's all relative really.It is also very psychological. I never noticed the cogging on the G29 till I read about people being annoyed by it. At the beginning it started to annoy me. But then I concentrated less on it and more on the ffb information and it wasn’t an issue anymore. Because the feedback itself was delivered “smooth”, for a lack of better word. The only reason I upgraded is the obvious deadzone in the middle. Which probably is there because the g29 has 2 motors?!? Also it lacked speed or torque when recentering in some situation. Don’t know anybody with a Fanatec wheel to compare though. So maybe the Fanatec is buttery smooth compared to the thrustmaster lineup. But that won’t compensate the cons of compatibility for me personally. If the issues are solved I might pick up a CSL and try it, before deciding to sell of the T-GT.
Personally I don't buy into the idea it should be perfectly smooth as most cars don't have smooth steering like that anyway. My issue with logitech wheels is I could feel the cogging constantly and pushing hard into a corner against the wheel I felt like it was breaking it because of the gears. I have a similar concern even with the V2 when I'm pushing it that I could break it if I really went for it rather than thinking damn this car wants to kill me.
Now obviously I haven't broken it and the Logitech g25/27 are some of the most reliable wheels out there but I like expensive things I'm putting a lot of force through to feel rock solid otherwise I get paranoid.