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.