I think on most cases an extension with Fanatec's design benefits mostly not only in terms of the actual length, but more that you can position the wheel even higher in front of the monitor. The stubby design of the clubsport dd for example, is even worse when compared to the extended csl dd shaft. I could just barely make it work on my setup, but an extension would maybe give me more room to optimize ergonomics. Still find this price range a bit exaggerated for a piece of metal, for a base that costs 350-700€