I did my research when I had to decide between the quaife, wavetrac, and mfactory, and for the overall value, i went with the wavetrac.... they basically took the design of the quaife (as with just about every other helical lsd), made a few improvements, manufactured it with the highest grade materials possible, and brought the price down to a bit below the quaife.... I have heard nothing about great things about them, but i will find out soon enough if its all true..