Hey, sorry I have been off this board for a while!
I have been using Dr. Lewenberg's formula for a year now. To be honest, I do not use as much as he recommends, but I aim for 3x per day...morning, afternoon, and before bed.
PRO's: I have grown hair in the front of my hairline, where my bangs start (however, that is not really where I need it although I will take all I can get, you know?). I have also had much less fallout, although there was an increase in shedding initially when I started on it. I like the spray application instead of the dropper type and my scalp has had absolutely no irritation, which I did have with Rogaine (significantly), and Dr. L says that you simply won't grow hair on an irritated scalp. Also, they are pretty good with follow-up. They should be since it is so dang expensive. They email and call me occasionally to see how I am doing. If I ever get to NYC, I can see the Doctor for free and I will.
CON's: The stuff is VERY expensive. Fortunately, money is not one of my problems, but if it were there would be NO WAY I could use it. Also, Dr. L is hard to talk to because he has a strong accent and is a little like a jokester.......anyway, I do better with email contact with THAT dude. I had really hoped for far more results at this point, but again I am not perfect with the application.
Overall, I do prefer it to Rogain and will continue to use it until something better comes my way. I hope this helps!