Didn't Ren use some type of super-secret cryogenic process on the Schaller magnets or something?
In my very un-scientific comparison of HRW's vs. Schallers, the HRW's sounded clearer and slightly higher output.
My test mules were my 535, 555 and 575's. In these guitars I like the HRW's better. However, my favorite pickup remains SD Seth Lovers.