Montoya is much smoother than you think. While he does brake late and is sometimes erratic at the wheel, his throttle/brake application is as smooth as anyone else. Sato, on the other hard, likes to use the pedals vigorously, steer vigourously, you name it. Lucky the BAR is a good car because if he was stuck with something shitty like when he was at Jordan, we probably would have seen "mowing the lawn" a lot more. However, I think Sato's driving style isn't as important as the actual configuration of the engine and gearbox. First, the Honda engine is nowhere near as stable as the BMW and second of all, BAR use a composite, carbon-fibre gearbox, which can be seen as one of the key culprits to Sato's mechanical failures. If you remember, the beloves MP4-19a, used a similar gearbox and boy did it suck at the beginning of the year. But what about Button you say? Well this is where driving styles come in. Sato put smuch more strain on the engine through his erratic throttle/brake/clutch application hence these failures. HOWEVER, Sato will only improve in the years to come as he is very open to criticism and is willing to take suggestions on board. And after all, he only started any form of motorsport at 19 and has absolutely dominated almost anything he has done. Expect him to be better than Button and Monty in the future.