You will notice the difference first when you compare to some other drive.
For a few days now, I have been comparing my "rip-lock removed" NEC 3500 and my Pioneer DVD 106s, and also with a new Aopen DUW1608 (DVDRW).
Comparison encrypted DL DVDÂ´s.
Aopen ripps faster at default (3.6x - 8.2x ) speed then my NEC "rip-unlocked", and is notably more quiet then NEC.
Pioneer ripps much faster (4.5x - ~12x) and at same noise level as my NEC.
I hope this helps.