I hate A8 magnets. I've done comparisons of them with ceramics, A5, 4, and 2's in several examples of the same pickups and they were consistently my least favorites. They have huge low end, which can be nice, but a really ugly, unmusical quality in the midrange and rolled off highs I felt. My 2 cents would be to just buy an A8 magnet, try them in some of you current pickups compared to an A5 or ceramic and see what you think. Definitely not for everyone
I've had the Arcane Mr Scary, Bulldozer, Tone Nerd Wicked (I believe inspired by the Mr Scary), some A8 Dunables and tried them in some Tone Specific sets made for me. I still like some things about those pickups, but the A8 part of it NO