Well you said the major point, you can't use them in normal races other than one make. The FGT sets faster lap times as it is more powerful. Between the F2007 and F10, i would pick the F2007. It seems so be faster, and have a much better turning ability. The F10 doesn't understeer, it just doesnt handle as good really. If you race without TC and SRF, definately go the F2007, it's amazing like this. The FGT can get a bit tail happy sometimes. Watch the oversteer on the F2007 if you don't have SRF on though, it's likely to slide out a little, but that's easily fixed with good car control.