How good Mules may be, not everybody needs PAF59-copies. It's a different animal compared to modern pickups like a NB. If you like NB's, Crawlers and CS just sell them. You make somebody very happy.
Btw, I totally love Mules and will keep them forever. I rate them higher than the Crawler in my strat, in which is performs beautiful. But I like the clear dynamic balanced Mules for a lot of stuff. They can do highgain too. I remember Nolly once made a metalclip with Mules. You just need the right amp. I like Mules on highgainamps, but ok, I don't play (much) metal.