I shot a test roll of Ultrafine Extreme (UN54) at box speed (ASA100), cut the film in half and developed one half in Rodinal (1 + 50 @ 16 min) and the other half in Diafine (3 + 3). I have the side-by-side comparison here:
The 5 x 7 print was a vertical slice of an 18" wide image on my enlarger baseboard.
Now I better understand the comments regarding Diafine, more specifically comments regarding image contrast.
and am also beginning to see this "Rodinal Look" that the Rodinal crowd likes. Along with souping this half roll, I shot a full roll (24 exp) of UN54 in WashDC and will post a few of those images as soon as I get back in the darkroom.
I bought the Ultrafine extreme on e-bay where it was cheaper than the online shop at Photo Warehouse.