I had Purple for a while in my integrated and DAC. It was interesting, but I ended up preferring the sound with it removed eventually; too much bloom and mid-bass emphasis. I could see these working for less musical systems though.
I think this is honestly a cash grab and realizing that competition from QSA has proven there’s demand for higher priced fuses. I’ll try one in my DAC. Only thing I’ll lose is time, but for me it’s a fun process.