Well, I used it once, and will never again - I experienced the 'sudden death' syndrome (the bane of all ascorbate-based developers), and ruined a roll of film ('sudden death': dev. goes bad suddenly from one film to the next, without any visible clues, like color changes).
And frankly, there's really nothing that makes Ilfosol stand out - a bit sharper than ID11, but not as good as Rodinal, but with rather lagte grain as well (at least that was my experience with HP5+ and FP4+).
Roman