I have tried RPX 400 in 120. Shot with Rolleicord @E.I 200 to develop with Barry Thornton Two Bath.
Camera: Rolleicord.
Filter: Gelb-Hell
Developer: Barry Thornton Two Bath, 4mins and 45seconds in each bath.
Paper: Adox Vario Classic.
Sharpness: Very sharp.
Grain: Invisible on 19x19cm prints.
Contrast: Flat with Grade 2 filter. I have used Grade 2(base exposure) and Grade 5(1/3rd of the stop from base exposure)
Toner: Selenium toning.
Result: Got outstanding tones.
Other Thoughts: May be it require to develop it longer in BTTB, but I am happy with split-grade printing.
Past Experiements: Rodinal 1+50 for 14mins and 30secons and got high contrast negatives with pronounded grain.