I exposed and developed a sheet of the Arista.edu ISO 400 in PyrocatHD and it's quite nice. I suspect it's Fortepan and I'm sending some to Sandy King for testing.
Without doing any scientific tests and only exposing one sheet of 8x10, it appears that an E.I. of 400 is appropriate. I developed it in PyrocatHD 2:2:100 for 9.5 min, minimum rotation @ 24C and the neg prints on Ilford MGIV warmtone, without filtration - very nice tonalities.