I have been 2 months on propecia. I have noticed a very small decrease in sex drive and quantity of sperm. Also, fortunately a small regrowth on the back of my head (in the center of the vertex), but I do not have prior pics to compare. I hope this to accelerate during the next few months. I never have my hair that short, since as you can see my hair transplant scar is visible (its not that bad, having 1cm hair is undetectable). Cheers 
unk:
http://img823.imageshack.us/i/dsc03825m.jpg/
http://img813.imageshack.us/i/dsc03832t.jpg/
unk: http://img823.imageshack.us/i/dsc03825m.jpg/
http://img813.imageshack.us/i/dsc03832t.jpg/
