The wavetrac is quite an old design and a design that has a high wear rate, but ive not heard of any problems with the wavetrac diffs.
If there was a way of turning off the edl/xds and the traction control fully then that would really help the LSD/ATB diffs work to their full potential.
I have Peloquins high torque version diff on the vRS. Kicks in really nicely.