the Gs are the only two steering wheels with both paddles and a proper 6 H gear shift
the Pro driving have like a gear shift but its not like a porper car gear box, more like a electronic type one, I also belive the pro GT one has paddle shifters as well. yeah you do, but £250 is wayy too much for a steering wheel and it don't have handbrake
£150 for G27 yeah, very few differences between G27 and G25 from what I can see
also logitech make the only onces with a proper steering lock
another differences is that the driving force Pro GT has a single feed back motor, while the GS have dual with some sort of gears machinism, I don't own one yet, but for £100 unless you find a second hand G25 thats the best of the best