I took Propecia for 2 and half years, and my experience was:
1-It generally mantained the hair i had at the begining of the treatment, gave me a slight, slight regrowth in the vertex area.
2-During the time i was taking it, i've experienced my 1st cases of erectil disfunction (wich i NEVER had before), notice i didn't said that propecia gave me those problems, i said coincidently i had them during that period...coincidently, i thought...i was 33. Sure i'm not in my peak as i was when i was 20, but hell...
3-Other experienced things..i was slightly less active, i was much more passive towards things and people.
I thought at the time that those things could also be related to me, becoming older..wich in certain part, i have no doubt had it's importance to, so i decided to take it, till by a number of reasons i said to myself..heck, since i've mantained, but not seen visible regrowth in more than 2 years, and since i believe that hormones are a very complicated "business" and mother nature is also, and was seeing those side effects more and more noticble..let me stop for a while and see what happens...the result after more than 1 year since stoping!?:
1-I've had no shed, but how could there've been, since i never gained nothing or almost nothing..right?!?
2-I have the same amount of hair (at least based in the same non-scientific rules i've always used...mirror and photographs)
3-I realised after 2 or 3 months of stop using it, much more ejaculation, never had since, anymore erectil problems (no doubt i'll have them in the futur, in a natural process of age), i am more active as a person, DEFINITLY! I am also, AGAIN, more agressive in my behaviour twoards everything, and yet, my life is as good if not better as it was back than!
4-I've had, more..much more positive reactions from the feminin side...funny isn't it?!..and no, i've not became more atractive or positive..not visibly or noticble that is.
MY conclusion based in my personal experience(that's right, not YOURS..MINE):
What i had doubts if were related things due to inhibition of DHT, am now sure (after more than a year of stop doing it), that THEY WERE realated!! And with passing of time, am more and more sure of that, cause if some signs were changed after 2 months or so, others were more much more later changed...some of them, only recently were noticble!
With topical therappy, that i use since stoping Propecia (i've used some Elsom products, am now using Skin Biology Hair Signals, every day for 5 months), and with a healthy life, with an intake of a good suplement of anti-oxidants/vitamins...both in the form of fruits/vegetables/tea black and green as in oral suplements (life extension mix, but it could be any other cost/efective one)i've mantained my number of hairs and apearance...but most importantly, i've almost re-established myself as a healthy male, in this complex comunity...with my normal and natural behaviour, the one that is written in my genes..and that some people like, and others no doubt will always hate..but at least i'm....ME! Not a pale image, or a castrated half-male...sure, when i'll be 60 or 70, and in need to take for BPH some DHT inhibitors, i'll do it and accept more easilly some facts...but friends, not in my 30's!!! NEVER!
So in my case, YES, stoping using Propecia (or any other form or name of artificial DHT inhibition) was a very good thing..the best thing! I don't know if by now, i would have more 10 or 100 hairs in my scalp (or even if it was more, but i doubt that would ever be, much more), but the price i was paying and would pay, was and would be unberable and totaly disproportionated to the gains i was and would have..so here i am, a much more happy man with myself..oh, and not to mention...with still hair enough, to "soften" the head blows that life usually give us!
PS-Let's see if as bonus, i even have better results with my present therappy or with some futur promissing ones, that will come in the future..near, hoppefully!
PS2-This was my personal story, and this is not intended to influence or to say i'm more aware or smart than other people out there...do what you want to, but i felt the need of sharing my experience.