Its the to r q u e. ................... that you'll notice most of all and the ability to rev to 5k plus [ having had my mini One done by yourselve's, P_torque have come along way since then]
Blimey, that must have been a few years back!! Alot of Minis running around with the P-Torque mapping!
You are right though, the power is delivered for much longer at the top end without tailing.
Also, the 170PD's suffer from a lag hesitation at lower revs. This is ironed out