[neutron256]

Higher RPMs will be more wear and tear on the whole drive train. The ECU will basically shifts down when RPMs fall to a point near where the engine would stall if nothing was done. If you're very aggressively down shifting all the time and causing the RPMs to spike to say 6000 then long term this is going to be more wear and tear on the whole drivetrain.

If your not going crazy with it then there should be little to no effect.

I personally love the feel and sound of a quick double tap of the paddle as I enter a turn. The RPMs jump giving me lots of torque to accelerate out of the turn.