People, don´t forget the question. The question was "is finasteride working"?
Well, I say yes. You have maintained your hair. Finasteride first objective is to stop further loss. It happens with 90% of the users, and with you, I believe that happened.
Some lucky folks (about 48%) get a second benefit of the drug - regrow some hair. But if that doesn´t happen, it doesn´t mean that the drug isn´t working!
The only way to tell with certainty is if you quit the drug - if you have shedding after, it means FInasteride worked (and that hair would be the hair finasteride dependent).
Cheers