I read quite a few mixed reviews of the VHII bridge, where people didn't love it for different reasons. Some said that it could sound a bit thin (too much focus on harmonics rather than the fundamental note), and some said it was too bassy. It could work very well in the SG for all I know, but I feel like The Mule is a more safe choice. I understand it is not night and day difference from the Riff Raff, but apparently it sounds fuller, more balanced and rounder which is exactly what I want! The 57 Classics can be a bit bright and brittle, but apart from that they are not bad!
In a way I feel like I haven't heard a pickup maker's "true voice" and work before I have heard their PAF replica, which is particularly true with BKP due to all the work Tim has put into The Mule. Acquiring, analyzing and testing dozens of old PAFs, and using the best sounding ones as his starting point. I found an interview with Tim yesterday as well, where he mentioned that a company's PAF replica sort of creates a starting point and ground for all other pickup models. It's safe to say that my expectations are even higher than any BKP purchase before, but I am more than certain they will not disappoint!