Does the game send feedback to the ClubSport pedals? I was unaware there was force feedback to the pedals ...
Using a G27 and DFGT, braking is extremely unrealistic compared to a real car. In a car you use brake feel to judge how much pressure to apply; in GT5 you basically make a guess at how much brake pressure to apply. Other than damage, braking is the most unrealistic part of GT5.
GT5 doesn't send feedback but CSP have a load cell (pressure sensitivity, not travel sensitivity) which offers an unmatched realism on that matter, and CSP have a vibration motor which simulates lock-up feedback (you have to set it for each car if you want, I use it just as a measure for my pressure, I've set it up so that it vibrates when I reach 100%).
I had the "pleasure" of using a G25 once and man... that was the most unrealistic experience I've had. I even got worried since my wheel didn't arrive yet at the time, so I asked myself "did I waste 500 euros". G25's pedals are just horrible (same pedals G27 uses), travel is ridiculous, resistance is non existant and spacing is just silly. Just awful.
But man, CSPs are better than my real car's pedals.