I don't think it's offering anything over & above most one-shot fine grain developers, but it's convenient. I used to use it a lot when it was previously in the UK (early '80's!), but used it at 1+30 rather than the recommended 1+15, increasing the times by about 50%. The neck of the bottle is the right size to use a 20ml syringe, which will just about reach the bottom of the bottle.
It's sound like it's the equivalent to D-76 (1+1) or XTOL (1+1) in terms of grain and actuance. Would that be correct?
"The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."