I did. significantly. I used Propecia for 2 years and had great results (regrowth) but after 2 years the effects wore off and I started thinning badly again.
I moved onto dutasteride and the results were outstanding. A TON of regrowth. Much more than Propecia and no sides. I have taken it for some...
I took Propecia at around the age of 23 having lost a lot of hair (had to shave my head but knocked my confidence badly)... The results were excellent - a ton of regrowth that prompted people to speculate I'd had a transplant. Also had no sides. Fast forward 2 years and I started to thin again...