the "feel of this gear lever will be different from a DP gearlever because of the distance from the footrest (which is the lever pivot on a DP lever?
to the lever pivot on the after market lever; means the lever is shorter? (which if all other mechanical advantage is the same) the angle of operation is the same, but will require less foot movement and higher toe effort, (shorter lever arm<> shorter gear lever)
Another thing is with the DP setup the lever radius of operation is the length of the gear change lever? On the after-market rearset the lever is not centered on the pivot of support, (footrest) so during operation of the lever there is an element of change, to lever toe-peg to footrest distance, this will cause more sliding and scuffing your boot
and this type of design should have a rotating type toe peg
The DP design by having an idler rocker to effect the change from standard to reverse pattern, means the sensor push-rod does exactly the same amount of work and doesnt require any parts changing, as the change method is only determined by the choice of the link between gear-lever and the idler rocker
I you are not going to need race pattern, I wouldn't buy a DP rearset assembly, because its unnecessarily complicated and losses some adjustability and is very expensive