Acros (both the original and II versions) are classified as Orthopan films - not fully panchromatic, but not Orthochromatic in the restricted sense either. The effect is less red sensitivity, and conversely, more green sensitivity. You can use nearly all regular black and white contrast filters with it, provided your choice of red filter is no deeper than a 25 red. It is extremely fine grained. I rate it at 50 and develop it in PMK pyro, but any number of developers should work decently. It has its own look.
The current II version has slightly less blue sensitivity than the original Acros, and a slightly longer straight line down into the toe. But these differences are subtle. Sadly, Acros isn't available in sheet sizes anymore; but 120 roll film is easy to get.