The Busa wheels are relatively heavy because of the performance of the motorcycle. I have ridden mag. and std. wheel Busas back to back and the difference is astounding. As mentioned above it improves all facets of operation: acceleration, braking and steering. You will feel the steering the most. The single best modification you can make. Magnesium wheels are rather brittle so if you live in a state with poor roads, forged aluminum wheels would be a good choice. Wave rotors also lower unsprung weight and offer good value.