i have a 535 and have driven a few 540 six speeds.Even with the high gearing theses cars have the power and tourque is amazing,at 100 ks(60 mph) just give the throttle a squeeze and next thing you are doing 160 km hr no drama at all...I dont think the 540 is quite as well balanced as a 535.All three exapmes i drove didnt steer or brake as well a my 535.I dont think it would take long to get used to it.
Whatever you do if you are kinda thinking of getting a 540 DONT drive one.